Great value for money - mostly because of the location and facilities, but perhaps even more so thanks to Gustavo, who is an amazingly responsive and considerate host.
We were visiting Madrid as a couple, and the apartment offered pretty much everything we needed: a cozy bed, AC, fully equipped kitchenette and a table to have small breakfast/dinner.
In a short walking distance we had a great grocery store (Supermarket Dia), a locker service for early arrivers or late leavers (Lock and Be Free Malasaña), metro stations, a place to get your travel PCR (Democratest) and of course Gran Via.
Gustavo took care of any issue that came up ASAP, and was very attentive to our questions and requests.