Perfect location, near to several famous attractions and two easily accessible metro stops.
The apartment is spacious and attractive. Unless you have a problem with stairs or struggle to handle heat (there is no air con, but there are plenty of fans), I can't see anyone finding fault with the space.
Most importantly though, Xavi and Laura are incredibly kind and helpful. You will feel at home almost immediately and they both go above and beyond to make you feel welcome. Any questions or concerns we had were answered within minutes, regardless of the time. It was an absolutely wonderful experience to get to know them and they elevated the entire trip.