Zulma has a beautiful and spacious apartment that is kept spotlessly clean. It's in a very nice neighbourhood with lots of bars and restaurants, but not noisy and there is a nice local feel. The location is extremely good, just 5 minutes walk from Urgell metro and airport bus stop and 20 minutes to placa Catalunya and Las Ramblas. There is a bus that goes straight to Barcolneta beach too and which takes about 25 minutes. Zulma herself is wonderful host: friendly and very welcoming. There are strict house rules which are not all listed on airbnb, the main ones being no smoking, no shoes and no guests.
You need to be aware that she rents 2 rooms so you won't know who you'll be sharing the apartment and bathroom with (Zulma has her own). When I was there Zulma had rented the other room to person who had no reviews and who turned out to be a problem guest - for me as well - and this had a negative impact on my stay there. There is a lock on Zulma's room but neither of the guest bedrooms which does not create a great atmosphere - there should with be no locks so there is a feeling of trust or all the rooms should have locks. I would recommend Zulma's place with the caveat that you won't know who you will be sharing with so you may want to check with her who she is planning to rent the other room to. I would also ask her to confirm all the house rules beforehand so you do not have any unexpected surprises.