The house is great and it’s really in a nice residential area. Very quiet usually, but there is noise from the restaurant across the street. As long as you keep the master bedroom window closed, it’s fine. The bed in the recreation room was perfect for my teenage son. All the beds were comfortable and Mona is very accommodating. Really nice balcony sitting area for warm nights.
Walk to the National theater and anywhere Sentrum is 30 minutes, but buses are close and fast. Vigeland park/museum is only 10 minute walk. Not really within walking distance to all of the sites especially Munch Museum which takes nearly an hour walk or a 15 minute drive. Don’t bother with Uber in Oslo as they are slow and expensive. Bus is best.