A friend of mine emailed me this about Oslo about a year ago:
We rented a frogner´s apartment for two nights and after moved to comfort hotel near the opera house for 4 people it´s (70 euros/night).
The frogner apartment was near the nightlife. The hotel was cheaper (65 euros a single room/night) but located in the whore neighborhood.
Check out this link also:
http://www.telegraph.co.uk/travel/destin...-stay.html
i didn´t stay in either but The Hotel Gabelshus offers dinners. Total price stay+dinner 100 euros.
The neighborhood were the (good) nightlife happens near the streets observatoriegata, and Soligata. I´ve been to Palace Grill on a thursday. Although it sounds like a restaurant it´s not after 22.00. It has a open terrace with warm weather it´s great. If you look at their site they don´t even have english version. No cover charge. Just by the line to get in you will see the talent. We went there from thursday to sunday. This two days were the best one. Worst was saturday the average age is above 45 years old. Don´t recommend going there on saturdays, but check it out by yourslef, just don´t expect it to get better has time passes cause it won´t.
Other club is la belle sole. Haven´t been there, but a friend "disapeared" for 2 hours came back saying that girls were also beautiful but were more stuck up.
I got tell you that the party on Thursday and sunday were one of the best I´ve been in my life. Specially sunday, we had low expectations on nightlife but that was the night my friends picked up the SAS girls. I only knew they brought them for the hotel, cause next day there was a Chardonnay bottle on the check out bill. Those fuckers payed something like 650 krones. But hey the girls were very good looking.
Don´t go to Karl Joahn gate by night it´s full of midle eastern and indian people. Planet hollywood is for tourists (I didn´t go there). Akker Rygge in the night is also a waste of time. During the day it´s great for daygame, specially TGI fridays, the left side when you enter.
The general atmosphere in Oslo is really relaxed. People are not acostumed to foreigners so they are extremely friendly. Girls are at the same level than the ones you see in Copenhagen during daytime. Very accesible. A lot of times I said I was Brazilian cause that would make them more horny.