We stayed here in Sept 2016 for a long weekend and it was a fantastic experience. The apartment is centrally located and about a 15 min walk from the Metro. The bus stop is right outside and taxi cabs are available 24 hours a day.
The apartment is as described and the best part was that the host had prepared a tray of Spanish goodies for us when we arrived. It was a great welcome for us and we were touched by this gesture.
The rooms are clean with two rooms with king beds and one with two bunk beds. The place was spotlessly clean with lots of extra towels in the cupboard. The kitchen is functional and there is a department store within a 5 min walk where you can get all the essentials.
The location is central and well connected. It is close to the Sagrada Familia and the La Ramblas - but with the metro close by, almost any place is accessible. There are a bunch of small restaurants within walking distance, so in general, this is a great place to stay in Barcelona.