We had a great stay in Madrid at Sergio's apartment.
We were walking distance to everything we wanted to see and minutes to many plazas and restaurants. The apartment is large and was clean, the bathroom has been updated since the photos were taken which was a nice surprise.
We did find the apartment warm in the evenings but with the traffic/street noise didn't want to leave the windows open. When we arrived to the apartment, we waited about 10-15 mins for our host to come and let us in.
Our children enjoyed cooling off in the pool and we were surprised to even see a lifeguard on duty.