We stayed in Barbaras apartment for four nights and it was perfect!
The apartment is located in a nice area, not very long from the center of the city. You can easily walk to the Ramblas and the old town.
But we even used metro and buses. We bought a T10 ticket (10 journeys), which is much cheaper than singel tickets.
We spent a lot of time at the beach. From Barbaras flat, you can take the bus 64 directly to the beach (Balconetas). It takes about 10-15 minutes.
The apartment was just as described. It was big enough for six persons, we were only two and had a lot of space!
There was wi-fi and it was mostly strong, but didnt work so well if you sat on the terrace. The terrace was by the way wonderful. We had our breakfast there every morning.
Barbara was a very helpful and nice host. We could reach here by phone, if we needed (happend only once) and that felt safe!
I will be recommending this apt to any of my friends visiting Barcelona. And I would definitely stay here again!