I rented there a few years ago a coupel times (by the way it is, Mettetal Airport). I rented a 172M (1975). It was in ok shape. I believe it is was somewhere between 80-85 an hour to rent. I think they have some C150-152's also.
http://www.airnav.com/airport/1D2
When I rented there it seems they had some issues. They had a student total one of their airplanes (i believe it was a 172), he landed lost directional control and ended up bending one of the wings all up(was told by the CFI they weren't going to report it to the insurance company, for fear they might get their insurance yanked).
That same CFI a few days earlier supposedly had took off and began having engine problems and barely made it back the airport with partial power. The airport is essentially in the middle of the city and there isn't any palce to go except buildings and houses if you lose an engine.
The airplane I flew seemed to be in decent shape. Though i'm not a mechanic and this was about 2.5 to 3 years ago, so take it for what it is worth. They were nice people, before I rented I stopped by and asked if I could look at their rental fleet and they let me go out and look around, so you could do that.
The check out was a few T/O and landings with a stall and a steep turn. I looked in my logbook it was 1.2 hrs.
I wouldn't be suprised for prices to have risen dramatically, that part of plymouth has grown like crazy. It is a fun airport, jsut don't end up in Joy Rd. on accident.