Max is a kind, welcoming host and was able to communicate in English which was very helpful. The house was decorated with a fun flair and had limited but helpful amenities. The only part I felt should have been mentioned in the listing is that the upstairs/loft level has very low ceilings (about 5'7", or 1.7 meters). Communicate with Max in advance if you are driving, and he will help you find a good parking spot not too far away.
This has more to do with my own assumptions and is not a mark against the apartment itself, but might be helpful for other travelers: Having lived in Florence, I know most European apartments do not have air conditioning, but it was absolutely sweltering in the apartments at night. The windows all open to a courtyard so there is no airflow, and the fans only do so much. If you prefer it to be under 80 degrees inside, find an apartment with air conditioning while in Madrid.