We stayed with Alba and Carlos in February 2016 for 2 weeks. They were great about everything. Alba is extremely accommodating, very sweet, and always makes herself available. She graciously awaited our 1am arrival on our first night, and was super welcoming and inviting. She answered any questions we had throughout our stay, recommended places to eat and see, and booked an early morning cab for us to the airport on our last day.
The area is fantastic! If you are looking for a local experience, this is it. Do keep in mind that this is slightly more of a residential area, and most places will close earlier than others, but the neighborhood is so lovely and charming. A true tightly-knit community that will have you feeling like a local in no time. The Collblanc metro station is a 5 minute walk, and the local market is right across the street. There are also a few shops and plenty of restaurants in the area as well (big shoutout to El Com for breakfast; we went there 3 times during our stay after we had vowed not to repeat a single restaurant on this trip).
The apartments are nice and meticulously cleaned (Alba's housekeeper can be seen on the premises every single day).
We would absolutely stay with Alba again next time we're in Barcelona. Alba and Carlos really did what they could to make us feel at home. They are highly recommended.