We stayed in this apartment for two nights and it was beautiful - I didn’t want to leave! It was super clean, with a well-stocked kitchen and lots of homey touches. The terrace on the roof is magical. Easy walking distance from the train station, Prado, and lots of other things. We did not ever see the host but had a little bit of communication and they were very responsive every time we reached out.
The apartment is on the 4th or 5th floor, which didn’t bother us but might not work best for someone who can’t climb a lot of stairs. It also meant it was quite hot in summer - there is an a/c which is great but only in the main room, so the bedroom was still a bit warm.