I stayed in the Zing last month, and was satisfied: certainly it is a low cost room, so don't expect great luxury, but it was clean. It is cvery close to the gay bars and massage places, and I could go to my room with a joiner without going through the reception.
For dinner, I recommend the Poseidon, which has really great food for an affordable price (paid 444 bath for a 3 course menu) made by a chef from The Netherlands who came to my table to say hello in my mother tongue.