A very beautiful apartment for our short trip to Madrid. In a very lovely location surrounded by cafes and not too far from the museums, Saint Miguel's market, the palace etc. Be warned though, you will walk everywhere! Bring comfortable shoes and plenty of water.
The apartment definitely requires a basic fitness level- the 5 flights of stairs were exhausting, especially come the end of the day. Sadly, we also experienced an ongoing issue with the A/C during our stay, although the host did what they could.
All in all it was a comfortable space with all the basics. We would recommend, but wouldn't personally return.