No oral contracts are allowed for sales of real estate.  

If you don't and the relationship goes sour, he can argue that he has an oral lease and you need to give him 60 days in most places to get him out....meanwhile he's trashing the place.  

Do you need help in specific areas or all areas? 

You could offer to fix some or all of it, but advise them that the process of them moving in will delay and we will have to postpone the lease to make sure that the items are corrected before they move in. 

Should I send a letter, phone call, in person or all?

Is it financially worth it to do it if the answer is no to any or all of 1-5?

If you could do it, I'd also just rent to law students  - or all med students. 

Super nice of you to cover your contractors screw up, if the contractor had the keys and there is no sign of forced entry I would just do a back-charge for a portion or all of the cost of replacement depending on the age of the stolen appliances since 1 the doors were left unlocked or 2 his people ripped you off. 

I used to be very enthusiastic about it, really gung-ho and I'd do research for two/three weeks solid looking at deeds (liens) on many of the properties.I once gave a tip to a friend that if he got the property we would sell it and split the value minus his costs, it was oral deal (he was good friend), I could not afford the lien ($1700 plus subtaxes for three years), he ended up getting killed by a car crossing street.

Paint them pink or green or purple or all three.