Welcome, fingers crossed it will be a great summer as i am fed up of the rain now. Should be perfect for the roadster.
One thing i would say though is check the roof very carefully for any kind of rips, leaks or pulling (look at the top left and right joins diagonally up from the rear window) and that the opening / closing mechanism works well. If there are any problems at all just walk away otherwise its an expensive bill to fix.
I would also recommend pouring lots of water over the roof, particularly over the doors to see if anything leaks inside to the footwells. I and a number of others have had this problem and in the end it was the reason i sold the car.
Fingers crossed though that you have a gem