We had an amazing time in Rosa's studio. The localization is great, right in downtown, 2 min walk from a subway station and 5-10 min walk to the main attractions of Madrid.
The hostess, Rosa, is lovely and warm, and will do the best she can to make sure your stay is pleasant. The studio is perfect for one or two people. It's an interior room, but extremely well lit and perfectly distributed. The bathroom is small but extremely pleasant. The shower is very big and welcoming. In general, the place has a great energy that will make your days very pleasant.