Seller financing is alive and well for investors buying, not for selling to consumers however.First you can find MLS properties where the agent will mention that a seller may finance.Any ad for rent to own will more than likely be a scamming landlord, (finance, foreclose, rinse & repeat types) but they might sell to another investor which could keep them out of trouble.Sellers without a mortgage are ripe for seller financing, explain the advantage of earning interest while deferring gains.Just ask a seller if they'd like to make more on the deal earning a higher rate of interest than they will get from their savings account. 

-incredible reviews on all major vacation rental websites, repeat guests.The property was for sale for $110k and was reduced to $97k.

Then repeat the process to acquire more properties.  

Here are the numbers and please help me making sense of all thisCurrent market value of the property - $900,000Total units in the building - 4Rent from Tenant A - Currently vacant, should be leased out in less than two weeks (Aprox $2,600) Rent from Tenant B - $2,686Rent from Tenant C - $1,940Rent from Tenant D - $2,844Gross Monthly Rent = $10,070Monthly fixed expenses = $1,000 (security, common area cleaning, garbage, water supply, property management)Vacancy = 3% ($302.10)Repair & maintenance = 10% ($1000)So we have a NOI of $7,768 or $93,215 (Annually)Since the property is paid for i can borrow around 70% against this and put 30% down (Savings) and buy next one, and keep repeating this process and eventually build a big portfolio, focus on paying them down or perhaps selling some if i get good CapX rate.So far so good, Right?

We promote the importance of screening tenants and offer many tips as to how best to screen, satisfy and welcome back repeat guests. 

You've got a long time horizon so what I'd recommend is Buy-Hold or Buy-Reno-Rent-Refinance-Repeat (BRRRR).

Has anyone had success with paying cash to purchase, getting a home improvement loan or something similar for repairs, and then cash-out refinancing to pay off the repair loan and pull out all the money invested to rinse-repeat? 

They are a good way to build your repeat business and if you build a relationship with them they could also send you many referrals.

Rinse and repeat sir!  

Given my unique schedule my plan is to manage the accounts, and manage the managers for a couple hrs when I get home, Then sleep, wake up, family time, head to work, rinse and repeat.