This time of year the parking shouldn't be too tight, but it is expensive - as well as all the other services. Fuel there is super high compared to other European airports - Universal is showing their spot price at $5.50/gal as of today. We use Delta Aerotaxi for handling and they take pretty good care of us.
What version of G are you flying there? 717 is right, there is one way in and essentially one way out. I only go there in the summer, but the winds favor RW05 until about 1400, then they shift to favor RW23 - sometimes vigorously. I tried to tanker some fuel in there last year in the BBJ to try and save about 10 grand in fuel cost having banked on the wind dying down by our 2130 arrival, but watched in horror for most of our five hour flight as the winds stayed stiff out of the south west at about 11k. Fortunately, 30 minutes prior to our arrival the wind died down so we could land on 05 and (legally) get stopped by the end.
We stay at the Sofitel when we can and, given the financial situation over there (last summer was dead compared to 2007) you should be able to get rooms for less than 200 bucks per night at a number of nice hotels (with room service, internet, and elevators) near the Duomo. Strange, but the Sofitel is cheaper on the weekends in May than during the week (215US weekdays/186US weekends).
Try
this web site for local hotels, but call the joint yourself to get the best deal. If you go to the JJ Cathedral bar by the Duomo, tell Lorenzo the manager that Kevin from Chicago says hi.