We stayed for four nights at Yök Casa in March 2019. The very nicely appointed apartment is in a restored 19th-century building - the photos don't do it justice. Two rooms with a queen bed in each were lovely. There is one bathroom, unfortunately, the shower is a bit small but my sons and husband (all over 6') managed. The apartment had all the basic amenities. The kitchen is a bit small and not conducive to elaborate preparations but there is a stove and a fridge as well as what you would need for preparing breakfast.
The location is the best! It is walking distance to all the sights - The Gothic Quarter is 9 minutes and the walk itself is just as pleasurable. There is no noise. Beautiful balconies with lots of light. There is a beautiful terrace where they have their office and they host a welcome breakfast on the first morning after your arrival. Mari and Petz answered our many questions, gave recommendations and accommodated our request for a late checkout. We were very happy with our stay and I would stay there again when I go back to Barcelona.