For Homestay, please send an e-mail to: event@primarypurpose.no

Some reasonable priced alternatives near the church (C):

Saga Hotel / Lovisenberg Guest House / Cochs Hostel / Ellingsens Pensjonat
https://www.thonhotels.com/our-hotels/norway/oslo/thon-hotel-gyldenloeve/
https://www.lovisenberg.no/gjestehuset
http://www.cochspensjonat.no/?page_id=71
http://www.ellingsenspensjonat.no/

Saga Hotel and Saga Apartments:
https://sagahoteloslo.no/saga-apartments/
https://sagahoteloslo.com/saga-hotel/

Frogner House:
Underhaugsveien 15: https://frognerhouse.no/en/location/underhaugsveien15
Frydenlundgata 2: https://frognerhouse.no/en/location/frydenlundgata2

http://www.osloapartments.no/leiligheter-til-leie/oslo-sentrum/lille-bislett-8-24-26.html

This is a bit further away but still in a walking distance:
https://www.scandichotels.no/hotell/norge/oslo/scandic-holberg