if you do end up booking your own hotel, have a look at both the Holiday Inn Express and also the Premier inn near the airport. Both are good properties (although the Premier Inn is better) and have have a free shuttle from the airport. Keep in mind that your 10 hour transit on your return will only give you +/- 6 hours of hotel room time when you take into account the time needed to clear immigration, collect luggage, transit to hotel, check-in, check-out transit to airport queue for checkin, queue for security etc.