As a contractor, we only install quality equipment, and unfortunately a lot of cheap off brands can be purchased online.

Had him replace 2 doors today - went from wooden doors to metal doors.

Yes - you can install new outlets, fixtures, switches, and outdoor lighting.

I prefer seeing an installment sale of a business entity, that can be structured hundreds of ways, it's not a real estate transactions but may have tax transaction matters and such are not made of public record until shown with the Secretary of State as officers/directors/members or  owners. :)     

I try to incentivise them as much as possible by offering the following: 1) One full year of rent in advance (typically at a slightly discounted price from their advertisement); 2) I am responsible for any maintenance items excluding major mechanical issues (electric and hvac), which means if there is any kind of backup or plumbing problem, it's on my dime, but it also means that they are going to have a renter that is not calling them to fix minor things; 3) I release them from any liability related to the Airbnb; 4) I install a keypad lock on the front door and agree to leave it when I vacate; 5) After the one year lease we go month-to-month until March when they can get back on the seasonal leasing schedule (which I inform them of), and then I sign a year lease and pay as a regular tenant.

For example, I just installed Home Depot light fixtures at a home I'm going to list next week for $1.3M, but we spent a ton of money in the master bath and kitchen, where it matters. 

The landlord gets solar panels installed AT NO COST and hooked up to his common meter, which has a very nominal bill.

I'm installing some darker flooring and the current base board does not match with it very well.

If a water heater costs $600 installed and it lasts ten years it is costing you $60 a year.

I'll willing to install them myself, if I can find a RTA/Knock Down dealer the will sell it assembled.