We had a great stay in Felipe & Pilar's apartment. The place is very centrally located in Madrid, modern look and interior design and very clean. It has everything you need, also the kitchen is very well equipped and the beds are very comfy!
The bed rooms have most direct light, the living room and kitchen a bit less. All rooms are on the court yard, making it a very calm place to stay (although in one room you can hear the neighbors sometimes). We had some difficulties with hot water during our stay as the boiler reacted in quite an unstable manner (maybe it needs a check or clean?!).
Finally, Felipe & Pilar were very responsive and welcoming, plus they allowed us to do late check out on our day of departure as there were no other guests planned.
Overall, we would recommend this apartment for future guests =)