Played it at ArConate in Italy in 5 players and it was appreciated very much.
One thing we noticed: more than 50% of the times, the Rusalka player gave the offering and then someone else had to remind him of the flashback, because someone else (usually the petitioner) wanted to comment and interact with what the Rusalka just said. We suggest to invert the prompts on the cards: first the flashback, then the gift. This way we have first an insight into the mortal life of the Rusalka, and then we switch back to the present, where the choice of a particular gift (or refusal) might be motivated by the backstory.
Also, I think that page 29 in the pdf ("Petitioner") is out of order.
Thanks and ciao.