Top, top place to stay, if you can get the dates. As the listing states, there're stairs to climb which is the only thing I would call out to other travellers. We carried our three suitcases up and while we did need to put in the effort, we had no problems (this depends on the individual).
Back to the listing - the place oozes old school charm. The Lourve is literally a stroll across the bridge to, tons of restaurants to try around there and Julia is a wonderful host. It's a great area to stay and you get a taste of what it's like to live in an apartment behind one of those huge big brown wood doors that you walk past all the time in Paris . Yet it is quiet there and you get a good night's rest.
High recommended - would stay again!