I am brand new to motorcycling, am 6’2″+, and bought a 2009 Ninja 250r three days ago. Please take my comments with that in mind.
The only other types of motorcycles I have ridden are enduros and dual sports. By design these bikes accommodate taller riders more easily than some sport bikes, the Ninja 250 included. That being said, I feel comfortable on the 250.
My criteria for choosing my first motorcycle were, beginner-friendly performance, reasonable price, ergonomic fit, and aesthetic preference. I plan to use it as a daily commuter and for recreational riding on the weekends.
In my very limited time in the saddle of this machine I feel that it is comfortable for my frame. I took the MSF Basic Rider Course and recommend that you take the Chilean equivalent you mentioned previously.
There are many great motorcycles for the beginner, but these are my thoughts about the Ninja 250. Good luck with your decisions and have many safe and fun rides. Please post a picture of your bike when you get it. There is a link to a picture of my bike in my profile if you’re interested.
Ciao!