Hi there, there are a lot of alfisti staying at the 'van der Valk' in Assen, from there its a 10 minute drive to the circuit.
http://hotels.hollandbookings.com/hotel ... 0109091146
But, you cannot go to a nice bar or something, nothing going on over there. If you like to have a drink in a great city, you should book a hotel in Groningen! The drive from Groningen to Assen is only 25 minutes. On saterday and sunday we drive with a couple of fellow alfisti from Groningen to Assen, you can join us, that's no problem!
If u have more questions, just shout!
Greetz, Bert