The hotel itself is amazing - you can expect a great stay all around. The room is comfortable and nice to be in, with a large TV that let's you cast your own media apps (including Disney+, Netflix, YouTube & Spotify) onto it, which is really quite a bonus if you don't speak French and won't particularly enjoy any of the local channels. The service was prompt and polite, and all the staff were really helpful and friendly. The food and drinks in the sky bar were fabulous and were served ridiculously quickly - I haven't had faster service anywhere else - and the view from the windows and terrace were stunning. The breakfast also had a good, varied selection.
The one drawback to staying here was the area, which was dodgy to say the least. There was a homeless encampment nearby which had some quite aggressive people, and the area immediately outside the hotel seemed to turn into an illegal street vendor gathering with hundreds of people, many of whom made us uncomfortable and sometimes made inappropriate comments. However it should be noted we didn't feel actively unsafe at any point, just a bit out of place and slightly nervous. Also, the local transport connections are genuinely really helpful, with very quick access to tram, bus and metro.
If you don't mind putting up with a slightly lower brow area, this hotel really is a diamond in the rough and I highly recommend it.