Fernando is an exceptional host, he has sent me loads of tipps for Barcelona in advance and we were were able to leave our luggage in the appartment at a very early hour, despite Fernando and his helper still cleaning. What I also appreciated very much was the fact that Fernando left us some cake, milk, juice, water etc. So we didn't have to worry about finding an open shop on Easter monday.
The appartment itself is very well situated for exploring Barcelona and the neighbourhood is safe and quiet. Try out the restaurant just across the street, the fish menu was great.
It is a small apartment - after all this is central Barcelona - but we had enough room for three grown ups. We didn't mind, that the bedrooms are very dark, because I can't sleep with lights anyway. But for a claustrophobic this might be difficult.
Everything works fine (WLAN, kitchen utensils, shower, even heating, which we were quite glad off, because we had rather cold weather). The small balcony is quite a suntrap, if the sun is shining, but remember: Inner city appartment - do not expect views!
I would recommend Fernando and his appartment very much, great place for a city trip.