My husband and I travel regularly to Canberra from Sydney to visit our grandson who is a boarder at Canberra Grammer School.
It is a convenient location for us but more importantly, there is friendly and professional staff, very well presented and clean rooms and adequate parking.
We had one instance early on Saturday morning(6.15am) where someone came knocking or banging on our door looking for someone who it happens was in the room next door. This is the only issue I would offer for consideration.
I would certainly recommend the Diplomat to anyone wishing to spend time in Canberra.