I always provide fridge and stove.

The stove was upside down in the garage, missing parts and the landlord promised to give me another stove.It turned out I rented from the landlord from hell.

Removable stainless steel back splash behind stove.

We supply everyone with a stove and refrigerator minimum.

then point out what wouldn't work (ie nowhere to set anything next to a stove, fridge door opening catches on a cupboard door, etc) 

Stove igniters wear out.

You will also need to install cabinetry and countertops, and you may want to consider adding a small stove or oven if you plan to do more extensive cooking in the space.Finishes: Finally, you will need to finish the interior of the garage to make it suitable for habitation.

In general, the main issues that come up with city regs are adding a full kitchen (stove/cook=top), completely separating the units with a wall vs a door, and not having egress windows (big safety/liability hazard). 

If the appliances are theirs like the fridge, stove, microwave, and dishwasher - offer to buy them from them and leave them there if they move out for 50-80% of what they paid for them, I would wait until they are going to move though before deciding if you want to buy them or get new appliances - less hassle for you to have to go buy new ones and less hassle for them to have to move them somewhere that already has them. 

The tub drain, the breaker box, rodent dropping all in stove.