From the paint, to the floors, to the kitchen/bath remodel I'm sure it all looked great. 

The biggest impact will be interior paint, trim and doors, upgraded fixtures, bathrooms and kitchens. 

Other leaded surfaces has to be intact, it means no pealing or flaking paint.

It's impossible to paint each situation with a broad brush because it truly is case by case given the work that was done, inspector that is handling it, etc.

I tend to take my property off market "hold" during slow times for some painting, other small updates and would never consider it as occupied.  

I normally reply to posts but making a post :)Best bang for your buck I typically see when working with clients is exterior paint/siding and landscaping.

Scratch and dents that can be hidden either with paint or behind a cabinet.

Training them simply means you control the conversation and interaction not them.An example, a tenant calls and says, "can you paint my apt a different color, I don't like it".

Then buy houses at about a 10% discount.Buy house 1 for 180k and put down 45k and use 10k for some minor refresh (paint, new appliances go a long way).Buy house 2 for 180k and put down your 45k (25%) and use another 10k for some minor refresh.Now you owe 360k in loans.

SFH deal with schools, jobs, paint color, yard size, etc.