Location of this property is great. The space is cozy as it is advertised. A friend and I shared the apartment because It has both the bed & the sofa bed. However the sofa bed was uncomfortable with a rod/pole going down the center and there was only one (stained) comforter ... no sheets, etc. and two pillows without pillowcases that made sleeping on the sofa bed very unenjoyable.
We also had some issues leaving the apartment and getting locked out of the building itself but locked inside the entrance gate (as we left the keys inside as instructed). Apparently there is a button to unlock the gate that we were not told about during checkin.
Overall, though, the apartment was fine for the short trip/time we had in Madrid.