We prep the property for inspection before scheduling one.Loose outlets, dripping faucets, missing handrails, peeling paint, all fixed proactively.A pass on the first inspection saves days, sometimes weeks.6.

Leaky commode or faucet replace yourself.  

Are the bathrooms updated or do they need any updates (tile, faucets, shower, etc)?

New fixtures in the bathroom (I.e. faucets in the shower if not fully redoing the shower and only glazing them)5.

I am talking about burnt lightbulbs, leaky faucets, light switch not switching off....etc.I am trying to be a very responsive and empathetic landlord as my tenants are pretty good, and I want them to be happy where they are. 

I'd also suggest having a faucet with hose attached nearby just in case.

Tankless units hate inconsistent, on/off demandYour exact use-case, slop sink, occasional washups, random tenant usage, is where electric tankless performs the worst:Rapid cycling burns out the heating elementsSlop sinks often have low flow, and tankless units won’t even turn on under ~0.5–0.7 GPMFlow rate varies a lot with industrial faucets, and tenants twist knobs fastYou end up with “lukewarm water” complaints or units that won’t fire consistently.3.

Updating the faucets and shower fixtures are always a nice touch.

I doubt that every single little repair ever made like replacing the faucets, etc. needs to be disclosed, I imagine this is limited to material repairs like major plumbing issues, structural issues, major modifications without a permit etc. 

Used my phone stopwatch for one minute and used their outside faucet to fill gallon containers.  8 gallons per minute at a well depth of 125 feet.