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Two questions:
1. What are the minimum room size requirements that can still be
accepted for a listening room?

There isn't a real minimum. In fact, there are some smaller rooms that
sound better than some bigger rooms. The ratio of the dimensions of the
room are quite important. An 8 by 8 by 8 room will probably sound horrible.
But an 8 by 9 by 10 room will probably sound better than a 12 by 12 by 12
room. For more on this see Master Handbook of Acoustics, or Guide to High
End Audio by Harley. There are many other things you can do to improve the
sound of a room. Room acoustics are far, far more important than most
people think. It's probably the second most important link in the audio
chain, after your speakers.

2. Does it make any sense to buy a hi-fi for a temporary room when in
the future this hi-fi will be used in different room?

Sure. You can tweak to make different stereos sound better in different
rooms. Any decent stereo can be made to sound good in any decent room, even
if it would sound optimal in a different room.