Guu Izakaya is a fun place with tasty tapas and a loud, energetic staff of cooks and servers. The first time I walked in, I was pleasantly surprised when they all yelled "Irasshaimase!"
The tapas are a little on the pricey side, but they're all super delicious. I really liked the beef tongue, baked oysters, and ikapiri calamari. I also recommend the Asian-inspired cocktails. My favourite was the bamboo cocktail (melon liqueur, white wine, lychee juice and soda).
I never had any trouble with any language barriers, so no worries there. It does get pretty loud inside, so if you're looking for a quiet, low-key restaurant, this probably isn't the place for you. Also, the place is really busy, so be prepared to wait for a table. One time, my friends and I were ushered to this little side area where we could order drinks while we waited. Another time, they took down my friend's cell number and texted her when there was room available for us. Both times, it was probably around a 30 - 40 minute wait.
Overall, Guu Izakaya is a great bar with a lively atmosphere and cute Japanese staff.