The apartment is very well situated in the center of Madrid with a variety of restaurant, bar and entertainment options at your doorstep. It is large and nicely appointed. We were met at the address on time and the key handover went very smoothly. The only negative is the fact that the AC did not work in one of the rooms but given that my family and I were only there for one night, this was not significant. The address number of the building is slightly confusing as it does not follow the expected number order. This caused some confusion with our taxi and some meal deliveries but I consider this a slight "quirk" of an old building and part of the charm. It is important to note that the apartment does not have a lift and if you have luggage, be prepared to carry it up three floors.
All in all, it was a very pleasant stay and I would not hesitate to book it again in the future.