I was so impressed by this hotel. The bed is comfortable, the room was cleaned immaculately, the shower is adequately sized (I'm a big person), and the air conditioning works well. The breakfast is of high quality and good variety, and there is a tasty Thai take-out restaurant just on the other side of the building. Access to the convention center is by a convenient ten-minute walk.
The front desk personnel are truly outstanding. I do not speak French, but their command of English is excellent. Moreover, on my third day I had an accident where i was struck by a bicyclist on the street and, as it turned out, broke my arm. I did not know where to go for care, but the woman on duty at the time (I redact her name for privacy) put me in a chair in the lobby, brought me water, and called the paramedics and police on my behalf, keeping me apprised of where they were and what to expect when they arrived. She went well above and beyond just a duty of care, and I cannot say enough about my gratitude.
I recommend this hotel unreservedly, and if i am ever able to return to Nantes, this is where I will stay.