Took this ferry in April , booked the 0830 ferry and returned by the 1800 ferry . I went on a weekday Monday so it was not crowded . It was a ferry and rainy day . So it was terrible to visit the city in the rain .
That being said , here is my opinion of the ferries .
0830 ferry - top of the line ferry that was modern, clean and large. Similar to those ferries you take in the Baltic Sea to visit Helsinki, Riga etc …
1800 ferry - old dilapidated ferry with spoilt or busted seats , smelly and uncomfortable seats . I felt a little unsafe on this ferry with the life vests all strewn under the seats .
Guided tour -
It was a 1 hour tour that was rudimentary , uninspiring and the guide just wanted to get rid of us to return . As it was bad weather,, maybe she also wanted to return . So I would not recommend a tour - you can DIY at the tourist information and get a guide from there - the people there are more helpful . So my take - take the ferry but don’t bother the guided tour or eating meals at overrated and over priced restaurants in the old town .