Location: perfectly situated around Gran Via and Puerte del Sol. Sol metro station is 5 min walk away.
Host: excellent host. Very quick to respond. She was super kind and allowed us to store our luggage for 5 hours on our final day.
Building: access to the building is done through a third party app which was easy to use (requires internet connection). The building was fine, the elevator was tiny, however.
Apartment: the place was super clean with plenty of towels. On the smaller side but perfect for two people. The bed was comfortable and the shower had good water pressure. The TV had Netflix downloaded for late night entertainment.
Minor recommendations: all the walls had minor dents and scratches. Would look much nicer with a fresh coat of paint. Also the bathroom sink was very small and had minor drain issues. We ended up mostly using the kitchen sink to wash our hands.