Right now, I'm pretty suspicious.The good news is that her credit score is over 750, and I usually want over 700. 

depends on the quality of the assets and the reliability of consistent rental income.this is an age old argument and really a personal choice at the end of the day.

Can anyone recommend a good accountant that specializes in STR tax strategies for W2 earners?

You are most likely going to have the best luck of finding a good seller financing deal by searching out motivated sellers yourself, building rapport and then explaining seller financing.

They will also outline a good timeline and tips to help you get the best loan possible. 

Also in your area that is a little rural if its well and septic makes sure those are checked by professionalsif it has city sewer make sure you do a sewer scope on the line running to the street.. and of course make sure roof is good etc etc.and for sure you can offer what you want to pay.. they may not accept it but its up to you.also ask title company to give you current owner.. and if you want simply make a back up offer in cases the wholesaler cant close this happens a lot and you get a better deal. 

I need a good accountant do you mind sharing his info

Definitely a good question that would require a little more homework and guideline digging to know for sure.

Good Luck

If your records are good, you will probably win damages.