We stayed for over a week in Eli&Agus's apartment with two young children and had a wonderful time living like locals while exploring the neighborhood and further afield.
There are great restaurants close by and the Joan Miro Park has incredible playgrounds for children of all ages. Getting downtown was a nice walk or a quick and inexpensive taxi ride. There are several trendy neighborhoods very close by, within 10-15 minute walk with some of the best restaurants in the city.
The apartment is very spacious and was very comfortable for us and our children. Agus met us to check in, helped bring our luggage into the apartment, and gave a nice overview of the area. Eli & Agus were fantastic hosts and very responsive throughout our stay. I would definitely recommend the apartment. My only note for families is that the elevator is rather small and can't fit a larger stroller. Luckily we had a folding stroller but it would have been challenging with anything larger.