I'll start by saying that we already miss the views and sounds of the Sagrada Familia Basilica's bells in the morning and the sounds of the square. We could not ask for a better location. Alba was very responsive (almost instantly) to our questions. Our family consisted of 2 adults and 4 teenagers. Quiet place with great amenities, it even included electrical plug converters for US devices. Note that you are carrying large and heavy suitcases, there is no elevator and the staircase is a bit narrow but manageable.
All in all, super happy with our stay and our host. Gracias Alba! Below are a few highlights that you may find useful.

1) Outstanding location right across La Sagrada Familia Basilica.
2) Enough room for 6 people (2 adults, 4 teenagers). Don't expect a massive kitchen area that would find in an average US home. Toilets & showers work fine but are a bit tight if you have a large frame.
3) Ample and easy access to transport: taxis, buses, trains/metros, double-decker tour buses.
4) Great places to eat within minutes: cafes, tapas, churros with chocolate, paellas. For those missing the american fare, there is starbucks, five guys burgers, and subway sandwiches within the plaza.
5) Great Irish bar within walking distance
6) Several local grocery stores and fruit/vegetable mini-stores to choose from. Given our family size, we used Carrefour Express 2 blocks away from the apartment.
7) Several ATM machines within walking distance: Caixa Catalunya, BBVA, Santander
8) If you have youngsters, there are a few parks nearby to keep them busy: Jardins de la Indústria and Jardins del Baix Guinardó (this one has a soccer court - my boys spent hours playing matches with the local youngsters).