It's was very easy to find the boat from the city center and as soon as we arrived we felt very welcomed.
We were 20 and everybody has enjoyed the stay on the Lotus. It was clean, the beds were made when we arrived. Everything that we needed was on the boat (i.e.: towels, dishes).
Olaf has been a very good host as he proved to be very flexible and helpful. For those who want to have a great and unique experience in Amsterdam I highly recommend this accomodation.