Valentino is a nice player. Certainly not world class, but has the potential to become under the right guidance. Considering our system he has the biggest chance to become that at Inter.
He is creative, agile, pacey, and intelligent. His defending is not top noch, but far better than the likes of Cancelo for example. The sum we will pay for him is very decent in my oppinion.
One thing is certain: every Striker will be happy to have him, as he's been one of the best assist men in the Bundesliga (regarding Key Passes, assisting shots on target, and assisting goals).
Also please spare your time and don't search YouTube compilations on him, as you'll just find Games for Austria, and Cup games.