Bellevue Rheinhotel has a great location right on the Rhine in Boppard, with a beautiful façade and lovely outdoor terrace. The staff were friendly and the overall experience was solid.
A few small things kept it from being a 5 star stay for us. The rooms are starting to look a little tired and there are no power outlets at the bedside for charging phones overnight. The bed was two singles pushed together, which tend to drift apart during the night, and the duvets and pillows were clearly not down filled, which we are spoiled by at home and elsewhere on our journey through the Rhine and Mosel.
Otherwise a pleasant stay and a good base for exploring the Middle Rhine. Recommended.