If you want to experience the varieties of Chiangmai food, go there. It surrounds by greenery and natural vibes. This restaurant locates not so far from Nimman area but I'd recommend you not to walk there. Parking area is available for up to 10 cars....Toilet is OK but not super pleasing.
Hanthung Chiang Mai isn't so big so I'd advise not to go as a very large group. I was there twice, the first time with 11 people and the second time was 8 people, too packed for one table (although I saw the sign you can hold a party there). Food comes in small potions which is great if you want to try many things. Since I was there twice, I would say I ate almost everything in the menu and nothing disappointed me. You can find rare menu here as well as typical Thai food. However, I'd suggest stick with Northern and rare menu, personally typical Thai food there isn't so special. Drink is self-serviced but there's a cafe near by which you can order something from there (I haven't tried through).
There's no price in the wall menu but I'm not sure about paper menu. I'm not sure about English menu too and to order, you'll need to write down your orders yourself so I'm not sure about the system if you're a foreigner. Price is very friendly too.
To sum up, if I happen to be in Chiangmai and I'll have to take my group to try local food, this will definitely be the place.
PS. I was too hungry I didn't take a decent picture but I could share one I just randomly snap because I guess it can be useful.More