I loved Jon's apartment. While more expensive than other options we considered, it had a fantastic location and beautiful light/space. (The huge terrace would have been even nicer in warmer weather, but just enjoying the additional light and views was a plus, although opening the doors will require some strength!) Also, we were fortunate that although it is an older building it had an elevator, though be warned it is quite small (limited to 3 people and 300 kilos, so best to avoid if you are a large person).
Beyond the location I also enjoyed the apartment itself, which was clean and modern, with what I thought were lovely design choices throughout. For our family it was a great size, as the master bedroom was spacious and comfortable with an ensuite bath. The kids room was smaller with 2 small twins, but that was perfect for them. They also appreciated that the living room tv had netflix so they could watch their shows in the morning while we slept in. Also off the living room were separate half bath (which had closet with washer/dryer combined unit; handy but will take a really long time to dry) and shower room (small but useful).
Jon was a wonderful host, and sent us recommendations in advance with sights (some to be booked in advance like the Gaudi buildings) and restaurants (also some of which could be booked in advance). He also had those as well as apartment tips available there in a binder, and was very quick to respond with questions by text, and kindly left us some snacks and coffee to help us settle in. (We were very conveniently located next to a 24 hour market too, which was small but had basic juice and batteries, etc.) Reminder to take a power converter though! (converts to those 2 round prong outlets) While Jon offered to lend one when I thought I had forgotten it, I didn't want to bother him and was glad I had it, as well as a multi usb converter to attach our various devices.
All in all a great apartment I would be happy to stay in again. Thank you Jon!