We absolutely loved staying on Petra's boat. It is exactly what you see in the pictures, but surprisingly spacious on the inside. The roof was low, as mentioned, but we're short people and actually enjoyed feeling tall for once.
It provides with anything you could ever need, breakfast was great, the bed super comfy, shower hot. Everything was clean, the location is perfect. In a quiet area but within a couple minutes walking distance of all the sights worth seeing.
No complaints, we loved all of it!
Tip: check whether the fridge is plugged in before storing your wine bottle ;)