Have you considered that perhaps your price may be too high. Despite how much we might like them they were never a great seller and you are saying in your add that there is an issue with the AirBag and the Glowplug. Anyone reading that is going to think those are the reasons you went out and got another car.
Why not check the orange connector under the passenger seat. Pull it apart and push back together firmly. This generally fixes the airbag light. As for the glow plug, no fix for that other than to change them. I did a write up some time back and it is NOT as hard as others made out. You just need the right tool which I show in my write up.
Perhaps fix these then you may get your price otherwise consider dropping it or making it an Auction so it finds it's own price