I lived in a hotel last time when I was in YZ, Metro Park Hotel. It is a four-stars with the highest ranking in YZ at the time (2009). Hope there have been better ones there now.
there is a mall for foreigners in city center I remembered but forgot its name and direction, a lot of expats rented a place in the mall to open a bar, shop or restaurant. sorry have forgotten its name.... ask locals for information. I am sure it's still there.