This forum is to discuss different features of vacation rentals that you are already interested in to rent. We are not travel agents that help you find properties to rent. You can go to www.vrbo.com or www.homeaway.com or www.vacationrentals.com and put in all your criteria in to find a rental. It's really easy. There are 100's of properties in the area you are looking for. You can then narrow them down and email the owners with specific questions you have and you can come back here to ask other specifics.
If you are looking for recommendations, you can go to a travel forum such as Tripadvisor or Fodors. Good luck in your search!
Understanding that you charge owners for their listings and perhaps allowing travelers to post their needs is expensive, it is a important service (we are the consumers, afterall).
We have decided, after using this site as you suggested that it is entirely too time consuming and we have found our last 3 temporary rentals on Craigslist, with good results. You can see, that going through hundreds of listings to find out if seniors are welcome (for example) or if there are stairs (for example) is too much. You may think your criteria is good enough but not for us and we travel full time.
If you could find an affordable way to allow travelers to communicate their needs by posting requests for location and dates, you could enhance your property owners businesses.
Instead of saying "we're not travel agents" as an inhospitable remark (given you are in the hospitality business), you should be working for both buyer and seller; it would make you earn the expensive fees you charge.