If you are unfamiliar with Spanish or Barcelona, you will almost certainly need to carry around a tablet-sized digital device loaded with Google Maps or equivalent. From the menu, select the 'offline maps' option while you have a wi-fi connection. Then, when you go out on the streets, the GPS location cursor will move around following your motion on the street, referenced to the static map display on your device. There is no way we could have managed to navigate around the city without having access to this help.
Alba's place is located on a pedestrianized street, which presents challenges in trying to locate a temporary parking space close enough nearby to bring in luggage (we had 4 suitcases, arriving in the rain, and not understanding how to reach the building until the host appeared where we had illegally parked and led us there).
Long-term underground parking is available about 1/2 mile away, offering easy in-and-out access for one basic fee determined by length of stay, but the actual parking spaces are quite small and the support pillars and ramps for the garage levels require extremely careful navigation to avoid scraping the car body. We had a 4-door VW Golf and came close to body damage several times. Ask Alba about online booking.
The apartment space is on the small side, with a wide bed in a small room, adjacent to a small kitchen with 4 dining chairs and a sofa. The bedroom fortunately contains enough storage space to permit unpacking all the suitcases. The bathroom is also small, and a tight fit for a big guy (me).
On the plus side, there is an elevator for all 4 floors, and a very large, nicely landscaped and furnished terrace on the roof.
The kitchen is well-stocked with utensils, electric stove and clothes washer. The clothes dryer is communal, on the terrace level. Be sure and ask for operating instructions for each of the appliances, as these European units may have more controls and dials than you may be accustomed to seeing.
The neighborhood is quite pleasant. The building fronts on a large public space with benches and multiple small shops, and the surrounding area has a plethora of cafes and small vendors. A conventional supermarket (Spar) is within easy walking distance. One frustrating aspect of the city is that conventional restaurants (i.e. NOT cafes), do not open for dinner service until 8 PM. As a result, we literally spent nearly 4 weeks in Spain without having a conventional evening restaurant meal, as eating that late is very far removed from our customary habits.