It is perfectly located in terms of neighborhood (calm and safe) with all the necessities in close reach, and also in terms of access to the rest of Paris via bus and metro. The principle north-south and east-west routes of both metro and bus are close by. Get a metro pass and the city is yours.
There are two flights of stairs up to the apartment and the apartment is small. The bathroom has close quarters in the shower and at the sink. But all the necessities are there and the bed is superb. I stayed for a month by myself. If my wife had been with me, we would have felt cramped. All in all the apartment is very good value and is particularly well suited for someone traveling on their own. I would stay there again.