Accommodation in Phnom Phen and Siranoukville

coming to have a look at Cambodia as a possible life alternative to Thailand end of month.  any recommendations for reasonable and clean hotel/guesthouse accommodation with wifi. Close to wharf area where I am told I can find westerners (bartang?) to talk to, as my gf wants to teach English/Maths there (Filipino with full teaching credentials and over 20 years experience).

yes, you can find good, clean and cheap hotel in phnom penh and sihanouk ville