This is not an especially difficult piece. Notes are easy, the difficulties lie in achieving the tempo and pedaling enough to avoid total dryness without turning everything into mush. Evenness at the end can also be a little tricky, but overall it's easy-ish. I don't know what it would be officially graded but I would guess around grade 6, possibly 7.
Poll
Topic: Piano Level for Doctor Gradus ad Parnassum