So far, I've stayed at BCV, BLT, BWV, OKW, SSR, and VWL. Of those, I can think of three for a non-park stay, each of which has good reasons. Importantly, because you are not going to the theme parks, being close to the theme parks is not important. I think I would put them in this order:
OKW for its "island time" vibe, larger units, and *awesome* verandas--especially if you snag one of the units in Bldg 45 or 46 that overlook the canal. The setting winding among the golf course and watching the golfers is also fun--at least for me. The pace of life just seems slower and more relaxed here vs. the other
DVC resorts I've stayed at. The boat to Disney Springs is lovely as long as the weather holds out, but it does take a bit of time. That could be good for a non-park visit though.
VWL. It is close to MK, but because it's around the bend and on Bay Lake, it's incredibly peaceful. Sitting down by the water, either behind the old Trout Pass bar (provided no one is using the smoking area) or down by Geyser Point is another good way to spend time. The boat loop to the Contemporary and Wilderness Lodge is a pleasant way to see the lake. The walking path between WL and Ft. Wilderness is lovely, and there are lots of paths in the latter, too.
SSR. The resort grounds are quite nice---not as nice as OKW in my mind, but still right up there. The easy access to Disney Springs is a definite plus. Also some lovely walking paths, though not quite on the same level as Ft. Wilderness.
Personally, I'd pick OKW. It's point-friendly, it's relaxing, the units are large. The pools aren't great, but they are good enough. That might be a reason to try somewhere else, especially if you have tween/teen kids. With younger kids the only thing that matters about the pool is that it has water, and that water is wet. With adults only, I mostly want to be able to find a chair around the pool, and be able to dip in the pool and/or hot tub periodically.