We had an excellent stay at Alfonso & Guillermo's apartment! My father and I finally got to take this much-anticipated trip that ended up being five years in the making, and we could not have asked for a better place to rest our heads. The apartment provided spacious accommodations for two - each bedroom provides immense quiet for a restful night; the flexibility of two washrooms was much valued; the common spaces were tidy and provided AMPLE natural lighting (in fact, the entire apartment has superb natural light and we rarely used the overhead lights); and the terrace offered a delightful outdoor space to enjoy bites and beverages procured from local shops. The availability of flatware and dishware meant we were able to prepare a few meals during our stay. Both mattresses were exceedingly comfortable. It was particularly hot during our first few days in Madrid, but the air conditioning made for easy sleeping. What perhaps cannot be overstated is how impeccably clean it was. Truly. We not only look forward to returning, but will be recommending it to family and friends in the meantime!
(It would be remiss of me to not mention that the stairs to the second bedroom are a bit disorienting at first because of their layout - stacked alternating steps - but once you get the hang of it, you do not notice as much.)