It's a fantastic place to stay. We stayed for a week 3 people and a baby. You will have to carry the stroller up the stairs as there is no room to leave it at the bottom, but fortunately it is only up one short flight of stairs, and the person not carrying the stroller can open the door via the key app on their phone so you have your hands free. The apartment is located close to a nice square and Gracia is an amazing neighborhood. Each evening we would go out and even though the restaurants are small, they had no problem with us bringing a sleeping baby in a stroller and where very accommodating. This is definitely not the last time we have travelled to Barcelona with kids and we look forward to coming back again!