All guest houses and mini hotels do laundry at a good price travellers cheques cash at vietnam bank if you can no commision charges to cash into Dong
most hotels and guest houses will change (at right rate) dollars into Dong
Have a good time I was a bit edgy going to Vietnam but found it fantastic great people interesting tourd(easy to orginize)
good food easy travel go and enjoy yourself
Paul


Just a FYI about Vietnam airlines. When booking tickets in smaller cities you have to pay in cash. Usually there's an ATM nearby the office so no problem.
Vietnam is so inexpensive I rarely used my credit card. Had a great meal in one of the trendiest, upscale places in Hoi An and the bill with drinks/dessert was 72,000 dong...about $5 US

I can not believe you are unable to locate, secure, manage, or arrange a laundry service in VN, thats like saying where can I get a massage in Bangkok?...haha

Hahahha... to all those who are wondering.. (sorry for the late reply).
I live here. I have my own washing machine and dryer... so I never needed to look past my four walls for a laundry place.
Hope that makes sense! :)
Cheers!