The pre-08 Ninja 250r fits just fine (I’m 6’2″ with a 34″ inseam). You can ride the newer 250r but you will probably find their is a crease in the fairing that hits you right in the side of the knee. You are supposed to be able to tuck your knee in below it but my legs were too long. The Ninja 500r had the same problem. The Suzuki GS500F is a similar faired bike that does fit me very nicely.
Read the articles and discusson about a 600 superbike as a first motorcycle. Highly NOT recommended. Even a 650r or SV650 would be better.
I picked up an `06 Ninja 250r. It looks great, was cheap, easy to ride and still has plenty of power.
One disadvantage of faired bikes for starting out is that you will likely drop it early in your learning process. It can be quite expensive to repair the fairings. Naked bikes have less to replace in the event of a drop.
Craig