No mods really, it's been kept stock. It has some small upgrades such as the stereo and sparco pedals.
As far as problems it seems to be fine as off now, I just had work done on the muffler, but it was done by professionals and you shouldn't see problems with that, ever. I'm starting to hear some squeeks from the back of the car, it could be suspension, I don't think its anything major, but should should be accounted for.
Exterior is beautiful, no scratches or anything. Interior is also in great shape. There are two things that I need to mention about the interior, the shift knob is not the original, when I bought the car the original was missing (it was just the plain stick) so I have a semidecent, but not as good looking one on the car right now. It lights blue, but its not the nice chrome like the original. The other thing is on the seats, where its not fabric, I'm not sure what the material is, but the off white part is a bit dirty, I haven't tried to seriously clean it before, but I'm sure it could be if you know what your doing.
edit: Oh, I forgot to mention that the tread is getting pretty low on the tires. You'll probably be fine for summer, but I would highly recommend a set of all new tires before the fall.