The apartment is centrally located and easy to reach in Aerobus from airport.
And it is in walking distance to Ramblas and Plaza de Cataluna.
The apartment is very clean and there are 2 bathrooms so you never have to wait for your turn. There is a small kitchen with access to fridge and kettle but we haven't used it as there are few nice breakfast places nearby ( yummy sandwiches and coffees in very affordable prices)
Wifi worked well in commun areas but intermittently in bedroom we stayed possible because the router was in living room. Surely it worked well in another bedroom.
I will highly recommend Zulma's place.