4 adults and 2 kids < 8 years old can have a nice meal there. We did not have a reservation, so had to wait about 30 minutes for a table in the back. It is a crowded place (cramped actually).
Any duck dish was awesome, and very decorative. The ham croquette wasn't very special - we've had very similar across Barcelona. The marinated mackerel with strawberries was great, and not what I expected, not fishy, savory and sweet. The server spoke English, and was kind enough to explain what we were eating.
The desserts were a miss. The creme brulee was gooey. The corn ice cream was very special - not something I would order everyday but it's the first time I had corn ice cream. Not gritty.
The prices of the tapas is not cheap, but the experience was worth it.