If you want to have a very cheap stay, you should head to Etap Hotel Brussels Airport (less than 60€ per night).
If money's not an issue, you should try Holiday inn Brussels Airport.
Also there is a Campanile hotel at 3 minute's walk from Hubair and they have quite reasonable rates, between Etap and Holiday Inn.
Most Brussels Airport hotels have a free shuttle from/to the airport.
One of our guys is doing training with them and said it is at walking distance from both hotels, but that there is public transportation (I believe a bus) doing these hotels and bringing you quite close to Hubair.
The best optin would be campanile hotel because it is very close.
Good luck with your A320 type-rating Sisio
Ps: it seems Hubair is not in the airport itself but a bit outside, and not easily reachable from the airport.