We stayed in Sophie's apartment the last week of august 2017. The location is just great. The Gracia quarter is very well served, fairly far from the most crowded touristic parts of the city. Yet, we could reach the Gothic quarter in 20 min walking and the beach in just more than 30 min. We happened to stay during the local quarter festival and all the small streets of this quarter were very crowded till late in the night. This was a nice surprise as we confused ourselves in the local people and lived a nice experience in the authentic Barcelona. The place is safe and we did not have problems to walk with our teens till late in the evening.
The apartment is ok for a family of 4 (there is also an additional room with a small bed, useful for a 5th kid). The kitchen is well equipped though we used it only to prepare morning breakfast. There is plenty of excellent restaurants and pubs nearby that you really don't want to stay in the apartment. The bedrooms are located backward, and we slept well at night. Air-conditioning was very welcome as it was pretty hot in the week we stayed in Barcelona. Wifi worked perfectly.
The host is very friendly and helpful in addressing the small requests we had. She even offered additional mid-stay cleaning of the apartment. A small booklet with all the practical information was also made available by the host.
By and large, we had a very good feeling of our stay. When we come back to Barcelona, we'll ask again hospitality to Sophie.