The host is fantastic! She really made an effort to make us feel comfortable - she speaks good English, she explained everything we needed to know about the apt and the neighbourhood, and she even helped us with planning the logistics of our sightseeing and travel, etc.
The apt itself is really comfortable and there is everything you might possibly want. A great terrace where we had breakfast. The metro station is a 5 min walk from the apt house. And the apt is very quiet though you are in the city center (the main railway station is a 10 min walk, the Museum of Fine Arts is a 25 min walk from the apt building)!
A word of caution for people who find it difficult to manage the stairs - the apt is on the 5-th floor and there is no elevator (but for us it was not a problem at all).