The tour is a false advertisement and money grab.
The boat is not what's on the photo, ours was an old piece of s--t fishing boat (see in photo).
Don't be mistaken, a "private cruise" means there are other people on the same boat. This is also false advertisement, as I've called other boating trips from Gdansk (or Sopot), and they confirmed, that there would be no other people on the boat. These guys said "it's not individual boat". I don't think they understand what "private" means.
None of the amenities were on the boat (see the boat in the photo - what air conditioning? what WiFi?)
The booking staff were unresponsive (not replying in days), inflexible with the timing (even though this was booked over a month in advance), I had to cancel some other plans to make this trip they only got around answering just a day before, and rude (Pavel especially).
Also note that this is about 40-minute drive from Gdansk, in some remote village. Our driver drove like a madman, but your experience may vary.
We didn't go on the ride itself after seeing the boat. Luckily the van driver did not leave right away, so he took us back to Gdansk.
I've asked for my money back, they denied, and it's still in process.
An absolutely abysmal experience and waste of my time.