Sito is a good host. Communication was good, however the person to meet us at check-in was 1.5 hours late. The apartment is large and the air conditioning works very well, which is great in the hot summer in Barcelona. It's on the 4th floor, so you can get your exercise in walking up the stairs, or wait for the very small elevator.
There are only two towels per person, but no facecloths, so bring your own if needed. Also, the washing machine works well, but there are no clothes pins to hang up your laundry on the rack.
Beds are very comfortable, and night time noise was barely heard from the streets below. Superb location and tons of restaurants around. Highly recommend the cappuccino at Fermentum, which is right outside the front door.
Overall, a great place to base your adventure in Barcelona.