Well, when I was in hostel mood I stayed at Tipsy Tiger but that‘s a party hostel - not sure if that‘s your thing. Another good place (non-party) is Red Inn Heritage guest house but there are apparently 3 different ones. I mean the one that‘s closest to Chulia Lane and has dorms (think the others only have private rooms).
Last time they gave me an upgrade but the rooms are all the same, just smaller size for the cheapest type 🙂. Stayed there 3 times now and am always happy to return.