In general, I think Denis's place is okay for what it costs if you don't mind that it is about 20 mins train ride to the city. A lot of tours start at 7 am in the morning but there is a train that leaves at 6:09 am. However, I was advised by the Rail Tours customer service not to take any 7 am tour since the train leaves at Hueston Station, which is a bit out of the city center.
The unit is right behind Denis's home. It is convenient if you need something since Denis can bring it to you almost immediately! Denis is accommodating and friendly.
The downsides of the unit are the dusty floor, the clutter, and the small bedroom. Except for the hooks at the back of the bedroom door, there was no wardrobe or shelving for clothes in the bedroom, even the 4 drawers in the bedroom in the work desk are filled with stuff. Would be okay if you only stay a few days, but not ideal for my 14 days stay.