Funny this should come up, I was out hunting the Sombrero last night. What a rubbish night! Although cloudless, the sky was bright from north (Melbourne skydome) to the south (presumably the Moon pre-rise) or other unfavourable atmospheric conditions. To the South, I could count the number of naked-eye stars on my fingers. No hope of seeing a mag 8 galaxy I'm guessing. And from Starkler's comments, I might not try again from my backyard
And Prova, you won't be seeing any spiral structure on the Sombrero no matter what!