Joseph's place is perfect for a solo traveler. It's definitely very small, but you have everything you need. The building is super cute and felt very safe! And if you peer out the window in the distance you can see Sacré-Cœur in Montmartre.
And you can't beat the location - it's right in the heart of Le Marais and you can easily walk to all the other neighborhoods. I would definitely stay there again.