mari, jin81: Add to Nteerak's tips on Niman area
http://www.chiangmaiinfo.com/nimman
As for hotels, filter to Niman area -via Agoda (Tim will get you -5% discount, plus credit pts) or Booking.com. Both are established hotel websites
http://www.agoda.com/asia/thailand/c...mmanhemin.html
Taxis from airport for flat thb120 within city. But transport in CNX is either motorbike, songtheaw or tuk taxis (unlike Bkk). That's why you advised to stay in Niman area
Kns, CNX's on my mind