Here's another option. My husband and I made this run our first trip to Europe in 2011 - we stayed in London for about six days before spending four days in Amsterdam. We took the Stena Line overnight ferry to Holland. It was great. We left London from the Liverpool Station - Harwich International, Rail which got us to the Stena Line ferry. Riders without vehicles have to have staterooms, and we had a private two-bed suite (small) with private bath. Since it was over-night, it served as our hotel as well as our transport. It is the largest car/truck ferry in the world as far as I remember them telling us; there is a separate area for tractor trailer drivers. It is not a fancy ship, but very comfy with gift shops and snacks. Everything sort of shuts down at about midnight, and almost everyone goes to their rooms to sleep, ready to arrive ready-to-go in the morning. They activate wake-up alarms over the intercom in the rooms at about 6:30 from what I remember. We took showers and got ourselves ready to leave. We were then directed to a train that took us from Rotterdam to Amsterdam, and everything was handled very professionally -- they made everything SO easy both leaving London and arriving in Holland. We were very impressed and liked the thrill of using trains, buses, the Tube, AND a ferry during out first European trip. We took the upgraded package and were given splits of wine, fruit, and the private bath was GREAT!!!! It sort of reminded me of a VERY small college dorm room....and that was MANY years ago. We considered it a small adventure....at that time it was about $95 USD per person, but I have no idea what it is now. I was in my mid-60's, and my husband was in his early 70's at the time, and it was our first trip to Europe, and we had no problem as novices navigating the trip. Just a thought.....