If you've checked off Rome, Paris, and London from your travel bucket list, then you might be considering a vacation that doesn't require a guidebook. After all, vacations are meant to be relaxing and, let's face it, big cities in foreign countries can be overwhelming. To really have the ultimate hassle-free vacation, a spa rental may be just the ticket. Take a look at our top homes and villas that include a long list of luxurious, refreshing amenities.