Well. This is certainly a lively place.
I waited for 30 minutes to get in here for dinner. I was only with another friend, so we were waiting for a table for two. I'd imagine it would've been worse if I came with a larger group.
But that's okay. It was worth lining up 30 minutes for.
As so many others have mentioned, upon entering Guu, you're greeted loudly by all the staff. The restaurant itself is full of chatter and loud noises. You can see the cooks at work.
It may be hard for some to imagine such a loud place garnering such high praise from everyone, but it's not like *a child's birthday at McDonald's* loud. It's warm and welcoming.
The food is great too. I recommend the Kaki Furai, Takoyaki, and Kinoko Bibimbap.
Unless you love wasabi, stay away from Takowasabi. That sh*t's strong.