Viking does a great job marketing and we were sold a “first class experience” when booking one of two explorer suites. These suites are right above the engines in the back of the boat. Low water on the Danube exasperated the loudness if the suite and the vibrations made our teeth chatter. We had to be moved to another room on the cruise. Horrific experience and very poor customer experience. Viking also has no automation for passenger boarding and leaving ship. Traditional ocean liners have an automated system where you put in your card upon entering and exiting the ship. Viking does this work paper cards that you are given (and have to wait in line for) each time you enter or exit the ship. Ridiculous and so old school! They cruise officers were always looking for people at each port. I would also never add anything port extensions on with Viking. Very poor hotels, especially the Corenthia in Prague