Apartments Sixtyfour was a fantastic option for our family of four! Located in the heart of Barcelona, in Gràcia, we were able to walk to all of the restaurants, stores, and sites we visited. Our booking was the penthouse apartment, which was spacious (although the bedrooms themselves are a little tight - no room to open your suitcases in them), and the TWO rooftop decks are amazing. We watched the city at night and popped up the umbrella to eat a shaded breakfast in the morning. We also used the washing machine and were able to hang our clothes up on the drying racks that are available on the roof deck.
The only concern for us worth mentioning was the elevator. An old, tiny, hand-operated elevator, you can only fit four people at a time inside - without your luggage! When moving luggage, we sent three people in one lift, and one person with our bags after. However, the biggest issue is when other residents fail to close the doors! On multiple occasions, one of us needed to walk up many flights of steps to close the doors in order for the elevator to come down to retrieve the rest of us.
That being said, the staff was great, and we really loved our stay here. I think we would stay again!