Conny,
We just got back from Myanmar and we loved it! I can recommend a great hotel, the Pan Sea, but I'm not sure how much it costs. We had a tour package and it was included in the price. It's really lovely, kind of post-colonial and the staff is great. I found the website,
http://www.pansea.com/yangon.htm. You do have to change US $200, unless you're on a tour package, in which case you're exempted. If you're interested in a tour guide, I highly recommend June with Tour Mandalay. Also, remember that you don't want to change money at "official" places. The official rate is $US 6 to $1 Kyat. We did in on the "black market" and it was $US 400 to $1 Kyat -- much better don't you think?! We stayed in Yangoon the entire time and there's lots to do there. Beautiful pagodas, tons of great shopping and you can get great prices on Burmese lacquer-wear (I got 12 pieces for $41 US), silver and rubies, etc. If you have any more questions, just let me know.
HTH,
Larissa