Lovely, cozy apartment in a beautiful spot, with a great view, tons of beautiful books, and a well appointed kitchen and bath. This was perfect for what I needed, and as a woman solo traveler, I felt super safe here, zero safety issues--which is a big deal if you're alone.
This is a perfect central place to base from to see all the sights on foot or by metro. You can easily walk the marais or the Latin quarters, plus Ile St Louis is just a wonderful little village to itself, with markets, ATMs (fyi there's an INside one inside the back of the Tabac, if you don't like sidewalk ATMs), shopping, and delicious food, and friendly locals, all just steps away.
Two things I'd point out, the self check in key pickup spot is off site, about 800m away across the river, so be prepared to navigate that, walking or taxi-ing, (I had my taxi take me there and wait, then on to the address), and definitely keep in mind there are small/steep stairs to navigate if you're mobility impaired.
Ghislaine was available for any questions or issues I had while there, super helpful and responsive, and I'd definitely stay here again.