normaly ,
most thai massages are decent and are the best fysicaly,
most oil massage are not decent because the girls want to earn money and try to give a happy ending
but you can always say no..
there are several hotels around nana station that you can't find on internet(agoda,booking.com..)
best is to take a hotel by internet for 1or 2 nights and then take a more cheaper hotel yourself on place