Im 6.4 and a wee bit. I learned in a 152 and found that a bit cramped but doable. One tip was to fold my chart to A4 size for the shorter routes and use spring clips(bulldog clips) to attach it to the back of my knee board. This kept everything tidy as folding out the chart enroute meant lots of shoulder pressing and on more than one occasion the instructors door was forced open even though it had been secured pre-flight.
Post ppl I now use an A5 kneeboard.
Biggest tip would be to find a wee instructor