Emilio's and Silvia's place is great. I stayed with two friends of mine and the place is spacious, clean, and one minute away from the metro station which makes getting around easy. While not super central we actually liked the fact that it's a bit more quiet and it's only 20 minutes by metro to the centre so it wasn't an issue.
There is a 24 hour supermarket one minute away and a couple of other shops and cafes and Parc Guell isn't too far away and easy to get to.
We also appreciated having three separate beds which was great.
Would definitely recommend the place to anyone coming to Barcelona who doesn't need to stay super central and likes a more quiet, residential neighborhood.
Thanks!