Absolutely wonderful. We booked this private transfer for Tuesday, August 7th, 2018 from the Hotel Gracery Shinjuku to Disneysea. Our driver was ready and waiting for us before the 8:30 pick-up time with a sign that said my name. He opened our doors for us and was pleasant for the entire drive. The car was clean, the driver's information was clearly displayed, and he provided us our park tickets right when we got in. Being from the U.S., I tried to tip him at the end, and he smiled and politely declined. What an easy, wonderful way to start the day.
My only comment for those interested is that the park opened at 8:00am that day and we did not arrive until around 9:15am. If you are the type of people who like to be ready and waiting at the gates when they open to make a run for your fast passes, make sure you take a look at what time the park opens that day. We also only did the 1-way transfer, so we utilized the subway to get ourselves back to the hotel, which took about an hour and was quite crowded around 8:30pm.