My boyfriend and I spent a week in Cristina's apartment and in general everything was great. She was so responsive and helpful both before and after our arrival to Madrid. Check in went quite smoothly and she patiently gave us so many tips about Madrid. Even during the following days she was keeping us updated with all the events happening in the city.
The apartment is located in safe, quiet, non-touristy area of the city but still so close to the city centre (1 min walk to the metro station + 5 min with metro) and there are all the shops you might need just next to you (super markets, bakery, pharmacy, etc.)
The apartment itself is small but spacious enough for a couple. The living room is decorated with Banksy works which was very interesting. It is in the basement but still thanks to a patio (nice place to eat) you get enough natural light everywhere in the house.