See V.
Yelp
Attended the F1 races and qualifying this year and had a great time. The ticket provider had great communication and although they cannot guarantee exact seating location, we got exactly what we requested and were directly above P1 and P2 grid positions.
We had a very nice walk in through the forest to our grandstand location. Yes, there was some rain and resulting mud, and fairly long lines for food and restrooms, but if you are a fan of motorsports this should not be a surprise I would think. The fan enthusiasm is fantastic.
My most useful suggestion would be that if you are staying in Milan you take a taxi from Milan to your gate at the track. Taxis have special access lanes and will generally get you there and back fairly quickly. The first day we took a train and then attempted to take a bus and both were packed to overflowing. We never could get on a bus and our ticket class was meaningless on the train, even though we arrived a half hour early we still had to stand. First trip on qualifying day took over two hours! If you are a single guy going and need to save money then go for the train and bus, but allow at least 3 hours each way to avoid missing the track action. If you are there with your spouse please spend the $60 to $90 each way for a taxi, it is well worth it. On top of that the bus stop, and train drop off locations have a bunch of unsavory characters hanging out.
The food and beer "court" (or whatever it is called) was a great place to hang out between track activity, with plenty of picnic bench seating and great place to meet random fans from around the world.