Note this café is reviewed on Beanhunter as ‘Foundation Café’ and 'Fondation Café', so I’m posting this review on both.
We visited the café on the last day the owner (from Sydney) was running it. He said the café had been sold to French owners, so this review is based on the café as it was, pre-12 Sept 2016.
We enjoyed a good café crème (closest thing to a latte in Paris) and espresso, plus a cheesecake. No complaints—he knew how to make coffee, though it wasn't one I'd write home about. I didn't try the cheesecake but it was enjoyed by those who did.
Sadly, chocolat chaud was unavailable for one of our trio—the stocks of chocolate had run out. Alternatives to coffee were few, so if you're avoiding caffeine, your options are limited. Perhaps this was due to the change of ownership, and the usual alternatives hadn’t been restocked.
The café is minimalist in décor with a view to a green park at the end of the street. The entire front is glass, making the small interior light and clear.
Fondation was well-patronised during our visit. Most customers seemed to be regulars—a good sign—and English was spoken as much as French. The owner obviously built up a loyal following. Hopefully it will continue to be worth visiting under new ownership.
I'd go again if I was in the area but wouldn't make a special trip unless you're on a Paris café comparison crawl. I prefer the coffee at Ob-la-di, Loustic, Boot Cafe and KB.
To be fair, the barista/owner seemed tired and said he was looking forward to having time off, so we clearly didn’t catch him on his best day. Give it a try and post a 'new-ownership' review if you visit Fondation.