We were there for the weekend, and we had a great time. Mario's appartment is very nice, very well located, in the center of Madrid. You can easily explore the city by foot. The room and bathroom are very clean, the bed is very comfortable. It's quiet, you don't hear the street noise. And, on top of being great place to stay, Mario and Gustavo are wonderful hosts! They gave us many advice on how to best enjoy Madrid and made check in and check out very convenient. I highly recommend their place.