Everything was exactly as advertised, and the apartment was very well equipped for a long stay (we were there for a month, and very comfortable). The washer and AC in particular were very convenient and nice to have — the ac, specifically, as we were there during the height of the heat wave.
There is no elevator, which posed no problem for us, but may be relevant to other guests or those with heavy luggage.
The location was literally perfect — a few minutes from Gran Vía, very close to Fuencarral, absolutely surrounded by excellent food — you could try a new restaurant every day for a month without even leaving the neighborhood — and very accessible by public transport.
Many thanks to Raquel and her sister for furnishing our stay in Madrid — it's an easy city to fall in love with, and this is an excellent apartment to explore it from!