My wife and I are about to take our 2nd trip to WDW using rented DVC points this Thanksgiving. We are staying at Bay Lake Tower and also used them this past summer to stay at a 1 Bedroom Villa at The Boardwalk Inn. Both times we rented through David's Vacation Club Rentals
(https://www.dvcrequest.com). Their website has a pretty thorough explanation of how the process and pricing works if you don't find what you need on the boards here. In our (albeit limited) experience we have found it to be a great option to save some serious money on Deluxe accommodations at Disney World.
Ultimately, with David's they have a Cost/Points calculator where you can put in the dates you want to stay and it shows you how many points it would be for your stay as well as the equivalent cost in US $. There are two basic windows where you can request a DVC reservation. The first starts at 11 months out from your planned stay and goes up until 7 months out...that window gives you the best chance to get the reservation you want but you pay a slight premium or $1 or $2 per point for most resorts offered. If you choose to wait until 7 months out from your travel date to book, you can avoid paying the premium but you will likely have much fewer options and, in some cases, won't be able to get your preferred resorts at all.
You can put in a request for up to 3 resorts you want for your stay and they will check availability for your requested resorts. Pay special attention to the instructions on the request form as you'll need to be very exact with the names and details of your travelling party as that information will be used to make your reservation and it needs to match your ID! I will note here that you should ONLY request resorts where you are sure you want to stay as they will go through them in the order you submit them and if they find availability you'll be locked into that resort! Personally, we just submitted one resort at a time to see if that would work out and then, if not, we would submit a request for another option. There is a $105.00 USD fee per request but it's fully refunded if they can't get any of your requested reservations. If they do manage to get you a reservation then that $105.00 fee goes to the cost of your stay.
Once they have found availability at one of your requested resorts, David's will contact one of the DVC members they have on file as wanting to rent points and that member will actually book the reservation in your name. You will be sent a contract to sign and that and your full payment is then required. You will be able to do online check-in as usual and personally I found the whole process to be very easy, straightforward and totally above-board.
One thing to note is that if you want to add Magical Express or
Disney Dining Plan to your stay you need to do that through the David's site as those requests have to be routed through the DVC member to be made.