I have tried several scheduling tools - and Lunacal for me is (one of) the best! The concept is great, the setup easy and support is awesome! I asked them to integrate the option that weeks can start with "monday" - and two weeks later, voilà - they had implemented it.
For the future I would love to see more options to edit/individualize the booking page. I noticed that Lunacal is moving fast, so I think there will be more features in the future.