This apartment is spacious, cozy, charming and very comfortable. The full kitchen was convenient as was the washing machine. The apartment was nicely stocked. The location is very convenient - near Gran Via and the metro and very close to Puerta del Sol and the great lively neighborhoods of Chueca and Malasaña. It's really a perfect spot. There was also a convenient tourist shop only one black away. We were able to get tickets for day trips there.
The hosts were very easy to work with. No hassle with check in or check out. Oscar met us at check in and gave us great tips about seeing Madrid and explained the variety of neighborhoods to explore.
Note that even though the apartment is on a side street, it can be a bit noisy at night. There are many revelers out and about as well as a sanitation station (beware, for some reason, the sanitation workers pick up trash just before midnight). Closing the double window doors and putting on the air conditioning fan helped dull the noise a good bit.