Old Oslo is a borough of Oslo.
Neighborhoods of Oslo belonging to this borough are:
Grønland | Tøyen | Vålerenga | Kampen | Gamlebyen | Ensjø | Etterstad | Valle-Hovin | Helsfyr | Ekebergskråningen
Grønland is worth visiting for its many tasteful and good (multi-cultural) restaurants. The price level is generally cheaper in this area than in the rest of the town.
There are also shops from many corners of the world, and a lot of them sell cheaper bazaar type clothing garments, as well as the occasional brands.
The only shopping center in this area is Grønland Basar. It is open from 10 a.m. – 8 p.m. (6 p.m.).
My favorite store in this part of Oslo is Detaljer (Details); a shop that stands out in this neighborhood selling well-selected gifts, frames, jewelry, clothing for both children and adults, etc.
When you explore this area you will likely see a lot of immigrants as Grønland has become the multi-cultural melting pot of Oslo. After hours this is not the safest area to walk by yourself.