I had dinner in that restaurant. Actually we were going to another one but it was full and we ended up by chance in Bar Lobo. It was definitely a good decision.
It is located in the entrance to Las Ramblas and belongs to the chain "Tragaluz Group" with another 13 restaurants spread across the city. Apart from having a nice terrace in the street (without any free table) the place is quite big. Actually, it is two restaurants in one, since there are two floors, in the lower one there is the "Bar Lobo", specializing in "raciones" (literally "portions") and tapas and in the upper one "Elj apo nés" with Japonese food. Both of them are communicated from the inside, so the kitchen is shared and you can order dishes from the one or the other wherever you are sitting.