tenses

[Saneta]

Franciszek M. has taken up residence in the deserted school, on the second side of the road. He has occupied the director's cabinet..He sleeps/is sleeping/have been sleeping on the folding sofa/couch brought by the son who lives in Ostrołęka. In order to warm up he turns/is turning/have been turning on an electrical heater.

Please correct the sentences above and correct them where necessary..

Thank you very much

[Dozy]

"second side of the road" doesn't make any sense to me.
I don't know what you have in mind with "director's cabinet". Could you mean "office"?
"sleeps"/"is sleeping"/"has been sleeping" are all possible.
If you mean his son then you would normally say "his son". "the son" is not impossible, but has a particular stylistic feel.
"electric heater" is more usual than "electrical heater".
"turns on" and "is turning on" are possible in a present tense narrative (which has a distinctive stylistic feel).
"has been turning on" is possible, but again it has a specific stylistic feel. In plain English you would say something like "He has been using an electric heater to keep warm."

[Saneta]

on the second side of the road - I meant, because buildings can stand on the first or on the other (second) side of the street/road, so what is wrong with it, how it should be?

Many thanks for the whole help

[Beeesneees]

'on one side of the road'.
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Cheers m' dears!