I have also stayed at the Zing Resort and Spa in Jomtien twice, going back again next month.
Clean, friendly staff always ready to help, free wifi and TV in the Room, Restaurant serving breakfast until late and dinner, Swimming Pool and Sauna no problem with visitors, very near Jomtien Complex and the beach.
Yes the price is low, and probably even lower in the summer which is low season.
There is also another Zing Hotel not very far. Just make sure which one you are booking.