We have found this place just excelent! clean and cosy and well equipped. The location was just the best for us. It is in the middle of a nice old neighbourhood with cobbled streets and many smll stores, very quiet, and yet, very central, by being about 15 minutes walk from most major sights of Madrid, especially the great mueums. It is about 300 meters walk from two metro stations (of different lines), which, combined with Madrid's excelent metro system make it easy to reach every place in the city. We just could not wish for anything better. We had one small reservation, which is a bit weak WIFI connection, for the flat we were in, which was on the 3rd floor, but I am pretty sure that by the time you read it, the owners will probably solve this issue too.
To sum up: Excelent!!!