My stay at Berta's with my parents and my sister was really pleasant. Over the four days we spent in this apartment, we really appreciated the nice layout of the apartment in general, and its situation in the city.
The living room is spacious with a large sofa that comes handy after a long day visiting the city! The kitchen comes with all the cutlery and utensils you'll need to cook something for yourself (if ever you get tired of what Barcelona has to offer).
We liked the settings of the two separate bedrooms with their own bathroom. The first bedroom, bigger, has everything you need to settle with a large double bed and a large bathroom. The smaller bedroom is fairly good for two people with its two single beds, although, be warned, there's no storage areas in this one.
Finally, as a general comment, the ventilation system can be a bit slow to set the temperature of all rooms, and a little noisy as well. Be careful too, the metro passes nearby, so you'll get a slight rumbling from time to time, but metro does not work in the middle of the night, so it is still OK.
Although Berta was out of town during our stay, her friend and her were available at almost all time for advice. Thank you very much Berta!