Anna's flat is really quiet, well equipped and practical. We found it really clean and appreciated the fact that Anna had left plenty of towels for our family, pantry essentials and even shower gel and shampoo.
It's a little bit far from the centre but really well connected: we used the nearest metro station (El Coll - La Teixonera) on Line 5 and the bus V 17 to go to Gracia, as well the station Vall d'Hebron (Line 3) which is 12 mn away by foot but on more direct / faster line to the town centre. If you're looking for a quiet place away from the hustle and bustle of Barcelona at night time, then this is a good location.
The two things that bothered us about Anna's flat are 1) the creaky bed frame in the double bedroom (we put the mattress directly on the floor on the first night - and slept well after that) and 2) the construction works that are taking place just on the side of the building (we got woken up by loud banging noises at 8.30 am on our first morning - luckily enough, the following mornings were much quieter!).
We also felt that the rooms weren't as bright as the photos suggest: it's on the first floor so it doesn't get a lot of direct sunlight. It also felt a bit smaller than we expected but it is well organised and there's plenty of storage place.
Finally, all communications with Anna were really easy and straightforward, and she made us feel welcome in her home.