Bar Boca, Oslo
This is a very small and charming bar. It's decorated in a nice 50's retrostyle and has a few tables where you can sit down. It is very popular on weekdays too and it can be quite crowded sometimes. You better not be too claustrophobic... ;)
The cocktails here are excellent and you should check out the very large selection that they have. The service is also very good, and it's not too expencive.
You have to be at least 22 years to come inside, and there is no entrance fee.
Dress Code: It's a relaxed atmosphere and you can come in your casual clothes, or dress up if you prefer that.
This is one of the coolest spots in the Grünerløkkadistrict. And in Oslo, too.
It is really small, and very popular, so on Fridays and Saturdays, you have to be lucky to get a seat.
The place is as american 50-style as it gets. And they have specialized in making drinks, and have also given out an own book with drink-recipies.
At daytime there is a great shop (Los Lobos) door-to-door that are selling 50's-clothing, gadgets and records. You should take a look.
Dress Code: No problem
If it's difficult to get a seat at Cafe con Bar, it's almost impossible to get a seat at the 2 square meters of Bar Boca. But still, it's a great atmosphere. The owner of the place ( Jan Vardøens ) is quite famous and has published a pair of books with cocktail and bar-accessories tips.
Dress Code: pff... se if i care...