I have spent three days in this hotel with my 13 years old son.
The location is quite good: right above the metro station, a shopping center (inside the arena) and not that far from the center (you can actually walk to plaza catalunya in about 30 minutes)
The rooms are comfortable with design style. The only thing is the traffic noise.
Breakfast is very good and big, but if you do not buy it from the reception it costs you more (14 euros directly at the restaurant, 11 at the reception). Price is high but it is worth because then you almost do not need lunch.
I definetely recommend it

I stayed at B Hotel with my friend in August and we absolutely loved it. The location of the hotel is really good, short bus ride from the airport and next to a massive shopping mall and 5 mins walk from the magic fountain. We found it easy to get around with taxis, buses and walking. The hotel itself was lovely and as nice as it looks in all the pics. The pool is undoubtedly the best feature, limited sun loungers and obviously in August it was really busy but there was a big pool bar with chairs too. We couldn't really fault the room other than the lighting was a bit dark and the floor wasnt that clean. Spacious rooms and beds were fairly comfy too. We booked a summer special which was really good value and included a cocktail and breakfast for every night we stayed. Breakfast was good and varied, the usual European buffet selection. We ate lunch by the pool a couple of times and that was good too. Overall we absolutely loved this hotel, location, value, and service was all very good!

The hotel has a modern design aesthetic which fits well with Barcelona. Our room was on 5th floor overlooking street.
Good features: the staff was helpful, and printed and scanned documents for me.
The room was quiet, only sound was some road noise. The location was very close to the subway and airport transportation. The breakfast was nice with a good selection of sweets, ham, hot food and breads.
Not so good: The bath/shower was a modern disaster. It was very narrow tub, surrounded on 3 1/3 sides by glass. The shower head was a wand that sprayed water ever where.

There is not much you can say about this hotel, one word describes it all- perfect. Very professional and helpful staff, well designed rooms, flawlessly clean. Not mentioning its perfect location!! Loved it