The apartment is in a great location in Bastille, with patisseries, coffee shops, supermarkets and all kinds of stores within a short walking distance. Despite being on a pretty busy avenue, once inside the courtyard and in the apartment it is peaceful and quiet. If you're looking for a peaceful retreat in the city this is the place for you.
The apartment feels spacious for one in Paris and having a "separate" bedroom is a plus. The only slight con as other people have mentioned is the tighter than average shower which requires you to step up into. If you're a larger person you could have some issues with this. While it was a bit awkward at first and we quickly got used to it and it didn't bother us after the initial adjustment.