We had a good time at Lluis! We liked the place as it was small, clean and comfy, with everything you'll need for a 1-2 weeks of stay. Also we liked the fact that you could easily walk to Passeig de Gracia, to Arc de Triomf and other lovely sights near by. And even though it was in a building without elevator you only had to climb 1 narrow stair (important when you carry your luggage) .
Keep in mind that the place does not have windows with amazing views, as it is small and at a lower level. Also the bathroom is pretty small, as most of the bathrooms in Spanish old buildings. But these did not bother us so much as the sound coming from the cafe-bar next door. It closes up around 2am and if you are sensitive and not equipped with ear plugs you won't find it pleasant.
We met Julia the first day and later on Lluis and Teresa. They are very kind and helpful, answering quickly to any questions or demand.
Because we had a small issue with booking the place, Lluis kept us informed of the process at the end he actually left us a bottle of good wine at their place.
I would recommend them anytime as they are amazing hosts!