If it RIDES good and you FEEL good....it IS good! Forget about rules concerning obscuring your hub view, etc.
Comfortable body position, balance, and ease of reach is what counts. A good position allows your arms and legs to work and move smoothly and efficiently, achieving their intended tasks without cramps, pain or numbness.

Give us another update in a few days on how you feel riding it! I'd be interested in seeing whether you like it as much as I like mine. I got used to the tighter steering arc (some refer to it as "squirrely") in about 2 days- now I like it better than the old wide-arc steering of the long stem I had. Less wasted bar swinging movements when traversing gravel roads with stones everywhere.

"Another satisfied 5cm Stem customer" -Lisa "Squirrely" Johnson