We had a great time at Guillermo's place. The location was perfect! My husband and I are very active and walked to every part of Barcelona from his location. The room was bigger than I expected, it came with a mini fridge, and the way his living situation is set up you basically have half of the apartment.
He was also nice enough to stock our mini fridge with water and leave us a supply of tea and coffee.
As people have previously mentioned, there are many stairs and it's pretty narrow but the location more than made up for it. Plus it was a free workout.