A beautifully decorated, comfortable, and very quiet unit located toward the back of the building. Not a lot of natural light, but the apartment is well-lit with high ceilings and never feels dark or claustrophobic. There is an elevator, but except for toting luggage at arrival and departure, we just used the stairs for the one flight up.
This space is best for 4 people: two in each bedroom. I suppose you could put people on the couch in the living room, but that's your choice. The two bathrooms are compact but well equipped, and there are plenty of towels and blankets. The air-conditioning worked marvelously (we arrived at the tail end of the June heat-wave - 106F/42C).
The location is excellent: a half-block from the Mercado San Martin and a block from the Chueca Metro station.
Having a washer/dryer on premises is very handy for a stay of a week or more. The kitchen is well equipped, and the coffee maker uses standard Nespresso pods. Be sure to also pick up a bag of ice at the Mercado.
The host couldn't have been nicer or more communicative. Every question was responded to within a reasonable amount of time, and in some cases, considerable patience.
Be sure to visit Cafe Lolea down the street for excellent meals. A little further is the Panod bakery, which features an excellent selection of freshly-baked breads and other diet-busting items.