What should I look for in a used Alfa Romeo GTV coupe?
A full service history is a must because neglect can cause oil to clog the 2.0 engine, leading to likely failure. Cambelt changes are needed every 36,000 miles or three years, although the service book says 72,000 miles/six years. If it's neglected, the belt can slip or snap, which may wreck the engine. Rear suspension bushes wear, and if their clonking is ignored, linkages and arms can be damaged, tripling repair costs.
Check the tyre pressures, too, because the alloy wheels can become porous, letting air leak out. And, on 1990s' cars, check they have a red-topped master key as well as the blue-topped one. You can't get duplicates cut without it, and replacing it is expensive.
Rust takes hold in the rear deck where metal joins glass, and also under the rear arches. If it's visible, it's serious. Repairs are possible, but they will be expensive if they are to last.
Torn or frayed seats will cost more than you'd expect to fix.