A bit late but for accommodation, Burgstrube, owner Martin Bird, top bloke, like most the folks there are enthusiasts first and can help / arrange almost anything and its like less than a minute from the track...
Tunnel better for getting on and off than ferry (for me anyway), the only bad bit at the tunnel is the under car scanner bit that's worse than crossing tramlines in Edinburgh...
Make a trip of it, you can hit Zandvoort, Zolder (hotel de pitz with trackside balcony, top class) and Spa as well... Roads from Spa to Bastogne then into Mosel Valley awesome (go as far as Cochem then head north to the Ring)...
Were going this year too but not in the Z (cant fit 3 in her) so we go in the Deli and at the track its a hire car for me...
Top tip, keep a watch in your mirror before entry and on exit of bends for faster traffic and indicate to the right nice and early to let them see you know there there and move over to give room, most of all though... Have fun