I stayed in Yök Casa + Cultura for 3 days in august and had a great time!
The design of the apartment is both modern and very Barcelona. The hosts Petz and Mari were helpful and friendly and gave us great tips for local restaurants and exhibitions that we would not have found on our own.
The apartment is central, but off the main tourist track and next to a very cosy pedestrianized area with small squares.
Beds are comfortable :)
Looking forward to coming back!