After staying at the studio for one month, spending whole days out and in, I was able to know both the area and accomodation quite well. In light of this and with no grievances, I wholeheartedly recommend this studio for its practicality come comfort, urbanity come tranquility and for its remarkable situation: fifteen minute walk to the Île de la Cité while a thirty second walk to the always impressive Jardin du Luxembourg for a stroll/run/read, the Franprix just down the block or even the bio (organic) grocery store located just across. For those less inclined to walk, the RER B and many bus lines quite literally stop on or near the doorstep. Indeed, for those quite unsure of what to do with themselves, Anne-Françoise's generous supply of guide books are a great help.
Anne-Françoise was very nice and very helpful, only a phone call away if anything goes wrong (which it never did).
In sum, after forcing myself to think critically, I cannot locate a single issue (the price itself was very affordable). Though this may be a personal experience, the whole stay ran smoothly and without any hiccups. Though perhaps brush up on your French.