At 5'6" I have no skin in this game, I fit into this car really well
In fact sometimes it's a problem getting in and out because I like to sit pretty straight up in this car so the seat ends up too close to the wheel and I have to twist and turn getting in and out so the seat bolsters are showing significant wear.
My wifes brother was 6'4" and ~275 and drove a Fiat Spider in the late 70's and early 80's. From what I understand it was quite good comedy watching him get out when the top was up. Apparently if the weather was good in the winter he would drop the top just to make it easier to get in and out but rainy/snowy days were a show.