Lisbon, Portugal- Used UberX several times from downtown including the airport. Each time the car arrived in less than 5 minutes. Price ranged from €4 to €8 for downtown to airport.
London, UK- Used UberX in the pouring rain from Liverpool Street station to Tower Pier around £6.
Rome, Italy- Used Uber Black (no UberX in Rome area) from Termini Station to Vatican €14.