The restaurant is, as aforementioned, diminutive, but the causal space manages to feel comfortable and hip. Be aware that none of the seats have backs, so this may not be ideal for someone who needs a lot of room or back support during the meal. But, if they can suck it up, your friends will be in for an very special gustatory experience.
Fatta Cuckoo is a hell of a spot. The food is seasonal, locally sourced, and outrageously delicious. The portions are huge. The prices are fair. Perhaps most importantly, the chef is a guy whose establishment you want to patronize. He so loves food, he loves feeding people, and he loves doing it in a responsible, seasonal way.