Guillermo's flat is perfect: wonderful location, great space, lots of sunlight, cozy, and more than enough room for a couple. I can't recommend it enough!
Equally important, Guillermo is super responsive, punctual with communication, and beyond helpful when it comes to getting to and from the apartment. Antonio, who let us in, gave a very helpful overview of the flat and was available to answer any questions I had about the city (where to eat, drink, visit, etc) and was available for questions during our stay.
Definitely one of my best Airbnb experiences to date.