We have two other apartments one is in the same house and the another one in 5 min. walking distance they are suitable for one family of 2 to 4 people you can see them (not a room the entire home) on this web:
Super downtown w/ hot tub now at a special price $195 pr. night on 3rd. fl.,
www.airbnb.com/rooms/75610 at Bergstaðastræti 8, 101 Reykjavík in 5.min.walking distance. Now a special price $175 pr. night.