How long will have you been in Valencia/will you stay around? I can give some tips if you are interested, both about just nice living/food places or the tech community: public@francisco.io
We've been here for a few weeks, and are leaving in a week. Headed back to North America for an undetermined amount of time. We'll definitely be back though! Valencia has been great.
This cafe, Cafe ArtySana, is one of my favorite spots to work in the whole world! Great coffee + food, great wifi, plenty of outlets, and they don't mind if you work all day.