I stayed at Unite for just short of a week and I had a good stay! The internet is fast and reliable. The location is fantastic and is close by sites and transit. The building is very fun and they obviously put a lot of work into trying to be an involved hostel.
The rooms do get a tad warm at night. There’s AC but with 8 people it was still a tad toasty. The lockers in your room a bit short. It won’t be a problem for most but check with the desk if your items are bigger. Getting in touch with the front desk can be a tad difficult.
Overall I had a good time and would visit again. It was a great option for wanting to work while visiting Barcelona. Meet some fun people, stay in a fun place, for a great price.