We stayed in the apartment for a couple of days in September during our visit to Madrid.
On the plus side, it is very close to the subway and around 30 mins from the center and the airport, it is freshly redecorated and pretty stylish, has grocery shops and supermarkets nearby, checking in is easy and communication with the host was good and friendly.
However, you need to consider the following things:
Both bedrooms are on a basement level, the floors are pretty cold in the whole apartment, so you need to bring a pair of slippers, it is also quite damp (we couldn't dry any of our clothes) and lastly when flushing the toilet or using hot water, there is a rather loud sound coming from the wall every couple of minutes (I guess from some kind of a pump).
To sum up, I would say that we had mixed impressions about the place.