According to my personal experience in February 2017 I can tell you this :
This cruise is very good compared to the price.
Yes it is romantic, especially if the boat is not full.
If you want something in special, the crew may do their best, they are so nice.
The music is a little bit too loud for a smooth romantic cruise, but as Nichiren49 said, if you ask for something more private, they can to something for your.
Take into account that they are many different types of jazz music depending on the day of the week (consult the website for details). For example, Jazz & Blues may be smoother than Swing or traditional Jazz.
Apart from that, wandering around the city centre and its many old streets is very nice and may be so romantic, specially, eating a traditional "kremrole" while enjoying the beauty of the streets.
I hope you will envoy your journey in the Czech capital.
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