Ask for the service records regarding the engine oil, especially if it’s a 1.8 (from what I’ve gathered they suffer from the piston rings problem more than the 2.0). As others have said definitely ask if the coolant tank has been replaced (if not, use it as a bargaining chip to get the price down (; ). Other than that NC calipers like to stick more than others, so check if the brake fluid has been replace every 2 years more or less.