First impression when booked: They will send you a helpful and detailed guideline how to use the house, the boat and enjoy the city.
First impression when met: Marka is super friendly and carefully explained the house to you. They also prepare you a mobile phone with Czech simcard and a pocket wifi for you if you don't have a EU simcard. The speed is quite fast. I used it to upload/backup my photos and videos.
The houseboat is excellent. You will definitely find it worth every single of your cent. I'd recommend it for a family and group of 4-6 people.
When you have any question, the host will respond to you quite fast.
I had a chance to use the boat as the weather was really nice. The boat is very easy to use and the speed is reasonable and safe.
You should use it in the morning as the traffic on the river is low, you can have the whole river just for you. I'd recommend you to watch few YouTube videos about how to moar a boat before using. It will save you some time, also for safety reason.