El Trompo provides "authentic" Mexican food. I go back often, and it's usually for the Al Pastor tacos. Delicious blend of pork, onion, and pineapple in soft shells. Very good!
I also really enjoy the Pico de Gallo, and Guacamole! Food is consistently fresh every time I come here.
As for the Ambiance...
If you're stuck inside the resto, it isn't the nicest place. Better suited for a group of friends, or buddies. Definitely not a date!
If you're lucky however, you'll get a seat outside on their very limited patio. Great place to people watch. Kensington is home to a lot of interesting characters, which just adds to the experience.
If you're a fan of mexican food, El Trompo is definitely worth a look.