It has six double cabins, four bathrooms, two showers and a kitchen.
Most boats have two, three or four double cabins, but additional passengers can sleep in the lounge area.
If they can't find anyone, you get a double cabin to yourself without paying a supplement.
The cost for two days is $290 a person in a double cabin, and $1,190 for seven days.
The Rosa has four double cabins allowing it to carry up to 8 passengers.
Prices for both start at $2,690 a person sharing a double cabin.
She has accommodation for 106 persons in single and double cabins.
It was the only double cabin, twice the size of a single.
With the discount, rates start at $1,295 per double cabin.
Next year's rates are not yet available but the 1992 price was $650 a person in a double cabin, with three meals a day.