This is truly a wonderful space in a fantastic location to explore Madrid. I preferred staying in Las Letras far more than I did when I stayed in more commercial, touristy Sol area. This apartment is just a few min walk from Anton Martin metro stop, and also a few min walk from Prado and Thyssen museums! The immediate area is also full of lovely restaurants, cafes and shops. There is a super cool Jazz Bar about 30 seconds walk away with amazing cocktails (shout out to Mohamed the bartender! Tell him Tony from California sent you ;)) and low-key chill vibe.
Very comfortable, with appreciated amenities like washer/dryer, coffee maker, large TV with Netflix, Disney, Youtube etc and elevator (although the apartment is just a few steps up on the first floor). Would highly recommend, and would definitely stay here again!