Rotel Tours offers one bus that I would not think twice about boarding. Believe you me, I have had my fair share of horrible tourist bus experiences (particularly in Europe), but this one seems like it was made in heaven.
In actuality, it was made in Germany. These Rotel Tours buses are equipped with six-foot-long beds for each passenger. Providing almost all the comforts an actual hotel offers, Rotel Tours is exclusively for German tourists.