The apartment is in an unbeatable location; close to the Gran Via, Opera, Plaza Mayor and green spaces near the Royal Palace. The neighborhood has a mix of bars, restaurants, cafes, shopping, movies; all sorts of things to do.
Beds are comfortable and apartment is very clean.
The host was easy to communicate with and gave us tips on how to get there, things to do etc.
My only issue is that the neighbors often had their TV on, and it was clearly audible in the living room. Best thing to do is to do what most folks in Madrid do, and go out to see the many many things that Madrid has to offer.