First of all good luck with your new venture.
We hired Hazel in April 2005. We found the staff at the base friendly and helpful, but when we went through the handover of the boat we found it wasn't ready. I found that some of the lights weren't working, (in washrooms, etc) so switched them all on to make sure. Several more were found to need replacing. This delayed our departure even more. Not good first impressions.
The boat had been fitted with a diesel cooker and heating system. To start this up we first had to start the engine. While the system was running it made an annoyingly loud click every second or so. This meant it couldn't be left on low overnight and still be able to sleep. The cooker was also awkward to use.
We also found that there was a 1/2" gap above the front doors, which made the front cabin a bit chilly, especially as we had a little snow towards the end of the week.
On the second or third day we had to call an engineer out to sort out a leak in a pipe above the hot water tank. This had obviously been there for a considerable time as the floor below was absolutely rotten.
Again towards the end of the week we were heading back to the base when the engine kept on cutting out. We did manage to restart it, but it was a bit disconcerting.
The "comments" sheet at the end of the holiday was the longest we'd ever filled in.
We did see Hazel the following year when we were on a different company's boat, still chucking out loads of black smoke from the engine. But when we passed Middlewich's boatyard the year after, we did notice that Hazel was being gutted for what seemed to be a complete refit. I hope they got rid of that annoying diesel heating system!
As others have said, we don't necessarily look for luxury in a boat, but comfort, practicality, reliability and now masticating? toilets are what we look for.