I wouldn't recommend -3 to beginners, the layout of -3 is really different from -1 and -2 and finding your way, as a pedestrian, from -3 to the terminals, can be very tricky. You have to take dirty and badly-lit concrete stairs to gain access to -2 and then walk to the elevators.

I prefer the eastern part of the parking, corresponding to 2F2, rather than 2F1, full of cars of passengers traveling to Schengen destinations for 1 or 2 days only (unlike 2F2 which has longhaul traffic and passengers are less likely to park their car for several weeks).