My recommendation is to board if possible at the first stop, Ved Stranden, as by Nyhavn all the side seats inside are taken, as are the best seats on the outside deck. That said, it is a worthwhile and enjoyable hour; unfortunately, ours was in the rain and/or under grey skies.

The cruise covered most of the same ground as the free walking tour we’d taken and was given in both Danish and English (the guide switched between them and repeated himself over the microphone). It was comfortable and scenic, and we were able to get a seat on the boat by showing up just a few minutes before departure. I recommend first going to the leaving point to check the times and redeem the voucher for tickets.

We were there on a froggy day, but the view from both sides of the canal is still fantastic, the tour guide is very kind and friendly, yet knowledgeable to clearly explain all the spots and answer questions of customer. It was a very nice trip to gain knowledge of histories and cultures of Copenhagen. It's better view if you choose to sit outside the canal but it was much colder because of the wind. You can sit inside, there's heater and the tour guide uses microphone to make sure all customers from inside can hear him clearly.