I took it with me to an autoon the bus , other passengers were not really happy about it.

No need for 'autobus' - bus works fine! While you can say, 'I took it with me to the bus,' saying 'I took it with me on the bus,' sounds more natural IMO.

Finally , when we arrived at home, I started looking for a place where I could put ithim.

Close up the the space before the comma. If you are going to include the plant as part of the group you are in ('we' ie: 'when *we* arrived at home,' I think it sounds more natural to replace 'it' with 'him' so the anthropomorphizing of the plant stays consistent.)

First I've tried to put it in the main room, but there there TV is always a TV workingon and may be my cactus won\'t like it.

'always on' is more natural than 'working'

Then I moved the cactus to the kitchen to my mom.

SheMy mom was not very happy with my purchase.

She told me to take it offremove it immediately from the kitchen, because the kitchen is not a proper place for a cactus.

And in the corridorI tried to put my cactus in the hallway, but I could not put my cactus because the corridorbecause it is very narrow.

A corridor is more of an academic term, hallway is what you would have in a home.

So I brought the cactus to my grandfather;'s room.

Grandfather was very happy to see me with the cactus .

He asked us if we know The Garda Lake , and then started describe a big fish , which he hasd seen one timce a long time ago at the lake.

No space before a comma :)

And I found such a place atin the hallway -; I decidded to put the cactus there so we could use it as a coat hanger.

Today I visited a (plant shop / garden centre / florist) and bought a cactus.

Plant stores are often called garden centres for large stores and florists for smaller stores that just sell flowers

I took it with me to an autobus , bus, the other passengers were not really happy.

autobus is a _very_ old fashioned name, as we no longer need to distinguish between regular (automobile) buses and horse drawn buses, so unless it's the brand name of a particular line, it's not a term that people will use

Finally , when we arrived at home, I started looking for a place where I could put it.

First I've tried to put it in the main room, but there there is always a TV workplaying and may be my cactus won\'t like it.

She told me to take it offut immediately from the kitchen, because the kitchen is not a proper place for a cactus.

"take it out" already implies "from the previously mentioned place" so you can make this sentence simpler.

"take it off" would be used for e.g. taking it off of a surface like a table.

And in the corridor I could not put my cactus in the corridor because the corridor is very narrow.

More natural word order

So I brought the cactus to my grandfather;'s room.

GMy grandfather was very happy to see me with the cactus .

He did not understooand that the cactus is a plant and not a person and started to talk to it.

He asked us if we know ThLake Garda Lake , and then started describe a big fish , which he has seen one timsaw once a long time ago at the lake.

It sort of depends on the lake itself whether it's X Lake or Lake X, but Lake Garda is always called Lake Garda in English.

After some time I decided to find a better, more calm, place for the cactus.

And I found such a place atin the hallway - I decidded to put the cactus there so we could use it as a coat hanger.

I took it with me to an autobus ,on the bus, which the other passengers were not really happy about.

Finally , when weI arrived at my home, I started looking for a place where I could put it.

Are you the only person, or were you with someone else? If you were alone, using "I" makes more sense.

First I've tried to put it in the main room, but there there TV is always a TV working and may beon in there and my cactus won\may not like it.

Then I movedtook the cactus to the kitchen to show my mom.

She told me to take it off immediatelaway from the kitchen immediately, because the kitchen is not a proper place for a cactus.

And in the corridor II also could not put my cactus becausein the corridor, because it is very narrow.

So I brought the cactus to my grandfather;'s room.

I would connect these two sentences: "I also could not put my cactus in the corridor, because it is very narrow, so I brought the cactus to my grandfather's room."

Grandfather was very happy to see me with the cactus .

He did not understooand that the cactus is a plant and not a person and started to talk to it.

He asked us if we know The Garda Lake , and then started to describe a big fish , which he hasd seen one timce a long time ago at the lake.

After some time I decided to find a better, more calm place for the cactus.

And I found such aa good place atin the hallway - I decidded to put the cactus there so we could use it as a coat hanger.

It is a very nice cactus - two meters hightall, all green and with many thorns.

I took it with me to an autobus ,on a bus, and the other passengers were not reallvery happy.

Just a few small corrections to make this sound more natural. In English we just say "bus". If you are riding the bus you would say 'on the bus' rather than 'to the bus'.

Finally , when we arrived at home, I started looking for a place where I could put it.

First I've tried to put it in the main room, but there there is always a TV workingon in there and may be my cactus won\'t like it.

Then I moved the cactus to the kitchen toand showed my mom.

She told me to take it off immediately from the kitchenut of the kitchen immediately, because the kitchen is not a proper place for a cactus.

And in the corridor I could not put my cactus in the corridor either, because the corridor is very narrow.

Starting with the subject makes the sentence clearer

So I brought the cactus to my grandfather;'s room.

He did not understooand that the cactus is a plant and not a person and started talking to it.

He asked us if we knoew The Garda Lake , and then started to describe a big fish , which he has seensaw one time a long time ago at the lake.

After some time I decided to find a better more calmer place for the cactus.

And I found such a place atin the hallway - I decidded to put the cactus there so we could use it as a coat hanger.