We stayed at Claire's for a month and overall had a great time! It's a good amount of space for two people long term, as long as someone is okay with the short height of the loft.
For day-to-day activities, the apartment is super convenient - Lidl is right across the street, a bakery next door, and the Confluence mall only a few minutes away. To get to the rest of town, it's not as convenient since it's not that close to the metro (~12 min walk to the Perrache station on the A line). However the T1/T2 tram stop is right there so if you get lucky with the timing it's not too bad, but at off-hours the tram doesn't come very frequently (every 7-15 min usually).
The kitchen was pretty well stocked, and it even had a food processor! The dishwasher sometimes wasn't working towards the end of our stay, but hopefully it will be fixed soon.
One thing to note - there was no shampoo/body wash when we arrived (though we didn't check until pretty late so we weren't able to ask Claire about it, which was our own fault) and only one bottle of soap (even though the kitchen sink is logically the sink for the toilet since it's closest, it didn't have soap there when we arrived). Since we were staying awhile, I didn't mind just buying our own, but it says on the listing that it should have shampoo.
Anyways, all my complaints are fairly nit-picky and did not detract from our overall stay once we got ourselves situated, and I'd recommend Claire's place to others!