Is there any way to determine accurate position of WiFi access points. I have come across many ways about estimating user's position by using received RSSI but can we find the actual physical location of the access point itself by using the RSSI ?
If I read your question correctly it's a relatively simple problem but a hard solution in the real world.
Triangulation is your best bet at easily determining the location of the access point in theory, move to three points take the signal strength reading and bobs your uncle your access point is one the ceiling where you left it.
But this has one critical flaw, your phone/measuring device needs an accurate frame of reference. If your indoors GPS has gone. So unless you whip out your tape measure and use some software to determine each of the three Triangulation spots accurately in 3d space it's a waste of your time. Even if you did have GPS I wouldn't call it accurate for the kind of distances that you require.
Possibly triangulation, if you could have multiple devices to test from, or you could try physically moving the device and record the signal strength. Depending on the distance from the host to the device you might have to move the device quite far to get any useful positioning information.
EDIT: signal strength could also be effected by objects in the way, but if you collect enough data you could still get a rough location.