My apartment is located in the super nice and trendy Grünerløkka area. The apartment was renovated a few years ago and has a separate bedroom with large double bed (I also have an extra airbed if needed as the sofa is too small for a grown up). The living room is spacious and has a dining table, open fire place, sofa and table (it's actually my grandmother's old wooden chest) and a big flat screen, dvd player and a Bose docking station for your iPod. There is also wireless Internet. The kitchen is well equipped for cooking etc. The apartment also has a nice balcony facing the backyard.
Occasionally there can be some noise from the happy people passing by on the street at night but I've found it is the charm of living in this area :) Markveien is a one way street so there is not so much traffic.
Please no smoking inside the apartment. For a third guest, there is an extra charge of 100 NOK/night.