I enjoyed my stay in Jeff's studio. It is well equipped and has all one needs for a longer stay with working from home. It is clean and the bed is great.
Check in was efficiently handled by a lady friend of the host.
The newness of the inside of the studio contrasts quite a bit with the exterior of the building: it is in an older house in a smaller street in the Raval neighborhood, that looks run down. The common door of the building should be fixed as it does not open fully (not the host's fault).
The Raval does suffer from bad press, and I was a bit wary before going. During day time I found the neighborhood very convenient with all the small shops open 7/7. Night time it was full of tourists. There is a strong police presence throughout the neighborhood. But I would be a bit cautious going home alone really late at night. Some neighbors might have substance abuse issues. Night time was quiet.
Overall I was happy with my stay and would stay again. It might not be for everybody, though.