My husband threw me a 30th birthday party at Mercadito for about 18 people and it was great, we took over the front room. The staff was so nice and helpful, they planned the menu with my husband and during the party if the guests looked like they were still hungry, they brought out more food and didn't even charge us more than the original agreement.
The food was great, we had the three guacamoles, the queso "fondue," ceviche (the shrimp with coconut was my favorite) and the tacos. The margaritas were also really good (and I tried almost all of them) and although I didn't try the mojitos, people seemed happy with those as well. I had read that the food was worth the wait (less of a wait now with the back room) but I also wanted to let people know that I thought the people were accomodating and gave great service.