The site in Rustavi is the mountain to the west of the town. You cannot miss it as you drive to Rustavi from Tbilisi. It is a great location to fly when there is good wind coming from the West or Northwest. The launch site is at about 760 meters and you can fly down to about 460 meters.
If the wind is coming from the Southeast, you can take off from the highest point of the mountain, close to a mobile phone antenna. However, this is a modest flight, less than 200 meters of altitude.
Another flight is possible if the wind is coming from the East (which is rare) or if there's very little wind at all. You can then fly from below the large cross down to Rustavi, therefore from 760 meters to about 360. If you want to fly into the town itself, rather than landing next to the road, make sure you have done a detailed check for power lines among the buildings.
Access depends on whether you have a four-wheel drive. If yes, you can drive straight up the mountain (ask the locals). Without a four-wheel drive, you will have to go around the mountain on the road to Azerbaijan, and turn right into the road leading up to the mountain, but only once you're already fairly high up, with the mountain now located to your North.
Wind: practically all directions