I stayed in Maria's flat for one month. Maria and her family were absolutely great, very friendly and always ready to help. Communication was perfect.
The flat is cosy and has all the basic items you might need.
Being on the ground floor, there are a couple of things to bear in mind, though: it's a quiet area, but if there are people in the street (or in the staircase area) it can be very noisy; if you want to get some air you'll have to open the door right on the street, as there are no windows. Some pieces of furniture (in particular the sofa-bed) are quite old and the wood suffers from the high level of humidity in the room.
Overall my stay was pleasant, but the flat is better suited for short stays rather than longer ones.