Thank you all for the great help and advice.
I got the last avaliable room at Chalemporn Guesthouse, and it was cheap and looks great. Thanks for that one HV!
But thanks to everyone - I have made a note of all the other options and already passed on a few of them to friends.
I know that one week isn't long enough, especially for the first time, but it was a cheap ticket, and I just wanted to get my feet wet I guess - as well as everything else
Will let you know what happens, either in person at MTB or on the forum!