That time of year is low season in AC - so you should'nt have any problems finding accomadation, and generally staff in most PI hotels are very friendly - you might like to check out -
http://www.balibago.com/where_to_stay.html
Quite a building frenzy going on now - so you could well get a good deal on a new hotel - always better to stay somewhere as new as possible.
AC has system of buses and trikes - buses stupidly cheap and the trikes are 50 Peso from Fields bar area to pretty much most hotels - athough find the motorcycle sidecar set-up far from comfortable - so staying somewhere around Fields Ave is possibly good idea.
The only ATM is outside Voodoo - in what is easily missed as a phone box! The money changers on Fields (around the wet market) are very competative so $100 bills easily changed (forget about TC's).
Bars- loads - best is 24hr/day Doll House - Nero's, Blue Nile, Champagne the better ones. Bar fine 1200 P in bigger bars and 1000 smaller.
If your doing 10 days Phuket - 10 days PI - you'll need another vacation to recover!!
Good Luck!