We stayed at Sergi's apartment in October with 2 kids and thoroughly enjoyed it. The kitchen is very well equipped, the terrace is awesome - kids played there every day. Bakeries, convenience stores and cafe's are plentiful in Gracia and within 50 metres of the apartment, so we got fresh baguettes every morning for breakfast and if we needed something for dinner, the shops were usually open til late :) Sergi was also very helpful and made sure everything's ok. There are lots of pedestrian areas and you could walk into the city without having to worry too much about cars, which again was great with the kids. However, if you are a light sleeper and go to bed early particularly on weekends, you may find that the locals keep you awake, as the bedrooms are towards the laneway and the above mentioned cafes and restaurants will be busy til 3am in the morning. It was no problem for our kids or for us, and if we go to Barcelona again, we'll definitely try to stay here.