I've spent four nights at David's place with my mum. We both (34 and 66 years) loved the appartment which is really tastefully furnished and full of nice details. It is more than fully equipped and you can for example enjoy your Nespresso-coffee in the morning or take a very comfortable shower in the modern bathroom.
The appartment is located in a quiet and very nice 'spanish' street from where you can easily walk to e.g. Grácia (or other neighbourhoods) or take the metro to wherever you wanna go. The place is very quiet but at the same time really close to all the important spots in Bcn.
David is a really friendly host who is always there with a helping hand or great advice. I highly recommend to stay in David's flat and would always welcome him as a host in my place. And so would my mum. ;-)