We sold our previous residence this way, and it has been a great experience. I wouldn't recommend it to everyone, but it worked great for us, and we will likely do it again in the future.
Make sure everything is spelled out in the contracts, work with your local title company, find a company to handle the monthly payments and mortgage interest statements. Spend some time getting to know your buyer, what they plan to do with the property, who their friends and family are. Keep an eye on the place as best you can, without being a stalker, after the sale.
We didn't do these fees, but have a friend who does this on many properties, and he charges a high interest rate plus a loan origination fee of 25% of the loan amount, jokingly referred to as his scalp fee. (I haven't talked details with him in years, so not sure if that scalp fee is legal or if he still does it, but he did for years.). He made a lot of money this way and although most people ended up turning the homes back over to him (they defaulted), there were plenty that got a shot at home ownership and turning around their finances this way, and they appreciated it. Just more things to think about if you decide to go this way.