This apartment has veeery good location - most of the famous locations are 15-20 minutes walking from the apartment and metro station is maybe 10 minutes walking from your place.
The neighbourhood is very quiet and safe.
The apartment is pretty much high and the building is quiet old, so it was a little bit cold inside but nothing much.
The worse thing we experienced in the apartment were dirty rooms - kitchen, bathroom and one bedroom.
Apartment has everything you need - towels, hairdrier, iron, microwave, (dirty) dishes...
The host is communicative but speaks only Spanish.