I live in Hartford and whenever I feel like going out for a casual dining, Coyote Flaco is on my short list. People there have always been very friendly. The interior is nothing extravagant, just kind of fun with some pinata hanging from the ceiling, with lacquor red/brown walls and some comfy booth seating available. Bar features a long list of tequila and Mexican beers. I am not Mexican and no expert on the cuisine, but love their mole sauce (Enchilada Oaxaca is my favorite dish there), and their seafood soup (forgot the name). We've been there many times and never had something we didn't like. So, Coyote Flaco is very much recommended for a casual, relaxed dining.
Pros: friendly, casual restaurant with good food at reasonable price.
Cons: I really can't think of any for the kind of restaurant it is.