On the good side, this was a very spacious apartment, which is not insignficant. After traveling to several cities in Europe, I was beginning to get frustrated at spending $200+ per night on apartments that looked spacious in pictures but were, in fact, oversized closets. Luis' apartment was actually very nice-sized, clean, well appointed, nice applicances. It felt like the kind of place one would actually rent long-term if living in Madrid.
On the not-so-good side, the water heater was broken so after a long, hot day of travel, I could not take a shower my first evening - the water was freezing. The maintenance guy didn't get there until around noon the next day, so I also did not get a hot shower the first morning. I wasn't feeling my freshest running around hot Madrid. When I got home that afternoon, it seemed fixed and I got a warm shower.
But, alas, the next morning it was broken again, so I started off my second (and last) day without a shower as well.
Luis and Minty were both very nice and they even made sure I had some drinking water in the refrigerator when I arrived. However, as we gringos often find in latin and latin american countries, there was no sense of urgency in fixing the shower.
I am an AirBNB host in a Latin American country myself and I have a maintenance guy available 24/7 if anything goes wrong in my house.
When contemplating whether to stay here, I would just ask them to check and make sure everything is working properly. If so, it's a great and comfortable place.