If you rent points, you would rent for either Standard or Preferred.
Within those categories, you are able to request certain rooms. The usual advice applies, explain what you want not just a room number, and minimise the options. Very few specific room requests get honoured, due to the nature of being 98% occupied all year round. The chances of a more general request being met are less than with a non DVC resort anyway.
Now every so often DVC tell us, in our magazine or emails, that they prefer room requests to be made direct to Member Services. Only the owner can speak to MS. My suggestion is you ask the owner to do that, through the agency.
Plenty of people also use the TP fax requests, and anyone who books direct through Disney can also request direct. But as a renter you won't be able to phone the usual CRO number about it. For the best chance as a renter ask the owner to do it for you.
And please do not ask for an upgrade for a better room at the front desk. That will cost more points and, although they really shouldn't, there have been stories of the CMs just doing this and taking the extra points without the owner's permission. Not only will this cost you more, it could seriously upset the owner if they need those other points for a future vacation.