Enza, the relative that gave me the keys and the neighbor that explained to me how things work were very friendly.
The studio is very cosy, the description match quite well. The quality/price is fair.
There were no cats, so not smell either, just the usual from old buildings' pipes.
Things that could be improved (though might not be needed by others):
- the table and chairs are not the best to work several hours with a laptop
- better water pressure in the kitchen sink
- non-plastic cutlery, at least a knife
- to know a bit more in advance who is going to give you the keys or show you the place, their contact, where and when