That is going to be relevant to how in-demand your market is (which I have no insight on) but just food for thought before you panic too much. 

It had food exploded all over the kitchen walls & ceilings as the owner would simply heat cans of food on the decrepit gas stove.

Maybe we can grab beer/food and talk REI. 

What is better:- Italian food or Chinese food?

Just food for thought.

43 total units for 1.8 million-  Northeast Ohio, and hour from Pittsburgh and an hour and half from Cleveland6 six-plexes and 1 seven-plex C to C+ properties in a B locationBuildings will need roofs over the next 5 years, but no other major structural issuesIt appears to us that rents are at fair market value for the area, so there would be little room to adjust them upBuilt 1988-199027 units are one bedroom, 16 units are two bedroomWalking distance to several nice restaurants, gym, fast food, bank, multiple other commercial businesses.

How many of each fast food, hotel, insurance agency, etc are nearby?

Often mistakenly referred to as a type of construction or development, it actually refers to the type of ownership.condominium conversionChanging the ownership of an existing building (usually a rental project) to the condominium form of ownership.condominium hotelA condominium project that has rental or registration desks, short-term occupancy, food and telephone services, and daily cleaning services and that is operated as a commercial hotel even though the units are individually owned.

It is reasonable to expect it is coming from another unity, but even if the tenants appear to be clean people they might leave food out all the time.  

If the smoke smell is bad, you should probably wash everything down first, clean the carpets, and then use the ozone generator.These work great on odors from pets, food, or smoke, but it sometimes still requires heavy cleaning first.