The PO replaced the plastic toilet lines with braided metal ones, but the toilet angle turn valves were still somehow encrusted with filth.

I'd strongly consider a roof over with a 26 gauge metal roof. 

Looking for recommendations on gas vs. electric vs coils range.

I did an inspection of a stair system constructed with metal and concrete that was only 25 years old. 

They are currently shingled, but ive been told that it may be worth investing in metal roofing for various reasons. 

Just let the others know that you picked another applicant that met all your requirements and no, you do not have to tell them what all your requirements are.

A few of my wife's pictures taken on 9/5 showed cracks on the cement floors (obvious that I know I didn't notice them when we first saw the house on 8/15), a ~8" chunk of cement missing from the 6" thick foundation pads on which the oil burning furnace sits, with the HVAC 8" inlet metal collar on it rusting already. 

So I was screening for tenants for my rental, and this one family met all my criteria.

My dad was in sheet metal for years and knew alot about HVAC, he determined with a little work they were functional.

I said, "doesn't sound like an emergency, I'll get you guys a screwdriver set, but there's different screw heads that I'll have to show you if you never done it before".On the other extreme, I got a middle age tenant who used to be a home improvement contractor, belonged to the sheet metal workers union working for a municipality, was furloughed at one point.