Hands down, a great location in Barcelona! You're in the heart of the Gothic District and everything to do outside your doorstep. Klaus was a great communicator and quite informative.
The apartment is up on the 4th floor and there is a lift. But if you have any accessibility issues, there are stairs even to get to the elevator. While the apartment is furnished just fine, it's definitely has a "lived in" feel. There's nothing luxurious about the space, and honestly, could use a little sprucing.
Although it has a balcony that's long, it's narrow, and overlooks the other apartments and courtyards which arent very scenic. It's a very active apartment building with lots of neighborly noise. We weren't in the apartment much during daytime, but did try to sneak in a few siestas, but hard to rest because of the kids and dog noise. If you are a couple, two twin beds are stuck together, but there's not much comfort in that situation if you're used to being in a queen or king bed. It's a great space for lots of people though if you have a large group to accommodate!
By far, the pros outway the cons in this apartment. We had a good time in Barcelona and a big part was the location of this apartment.