This apartment is in a fantastic location, just a block away from la Cava Baja and all the action. Five-minute walk to La Latina Metro or Plaza Mayor/San Miguel Market.
The apartment itself was great. A little small, but that's to be expected in this area. Realistically, a good space for three or four people (remember, you're all sharing one bathroom). The hosts were super-responsive whenever we needed them. The wi-fi was always on and very fast.
One thing to note - this is a ground floor apartment and one of the bedrooms is facing the street. There will be crowd noise well into the evening/morning, especially on Friday and Saturday nights. Also, people are pretty loud coming into and out of the building after a night on the town (there are other AirBnBs in this building). Neither of these things was a big deal for us, but it's definitely worth noting.
Having said that, we loved our time here, and would absolutely stay here again without hesitation.