In July, my husband and I will be traveling back to the US from Lisbon through Madrid. Our flight is due to arrive in Madrid at 10:15 am. My husband's second leg will depart at 12:15 where my flight will not leave until 7pm (the 'cost' of a FF ticket). Since my luggage will be checked through I assume, I'll only have a carry-on. I am not sure how far the airport is from the city center but would it be possible for me to hire a private tour guide to see some sights for a few hours........even though very brief this seems like an option to pass the7 hours or so between flights.