Where to stay. Some links of the hotel-guesthouses.
We haven't stayed in all of those places but have visited the places and the reviews are mostly positive. There is always someone who is not satisfied but don't forget, you are in CAMBODIA.
All places situate in walking distance from pub street or old market.

Mandalay Inn
www.mandalayinn.com

Angkor Friendship Inn
www.angkorfriendshipinn.com

Mekong Angkor Palace Hotel
www.mekongangkorpalaces.com

Shadow of Angkor I & II
www.shadowofangkor.com

The Red Piano Guesthouse
www.redpianocambodia.com
Have stayed there personally. Nice rooms for the price. Has the same named restaurant on the pub street. Breakfast is included in room price and provided at the restaruant on pub street. Breakfast includes only baguette, butter and jam + small bowl of fruit salad. Coffee or tea. Not very impressive but for me was ok.

Encore Angkor Guesthouse
www.encoreangkor.com
Just opposite from Red Piano GH

European Guesthouse
www.european-guesthouse.com

All reviews are taken from Tripadvisor.

Feel free to share your experiences.