This is a great place, I'd strongly recommend it if you're looking for a place in Paris on holiday or even for a longer stay.
It's a one bedroom, separate living room and nice, modern, bathroom (looks like it was maybe recently remodeled?). I found it to be more than enough room for 1 or 2 people and could probably fit a couple more, if needed. All in all, for Paris I thought the apartment was VERY spacious.
Pretty comfortable too, has most anything you could need – from bath towels to even a printer! Building is quiet and peaceful.
About the location: if you wanna be central, easy access to everything but away from the herds of tourists in a more low key, residential neighborhood, look no further. Here you can feel a little bit of real Parisian life yet you're close enough to any major attraction, museum, etc, you might wanna check out. The street where the apartment is located, however, is very lively, in the middle of an area where there are plenty of nice restaurant, bar and grocery options.
Transportation: the subway station is *just around the corner* and, depending on where you're headed, there are also a few more subway stops at just 5 min walking distance with more/different lines. Gare Montparnasse is something like a 4 min walk. From there you have access to trains, trams, high-speed trains, etc, taking you to anywhere from the suburbs to other cities. It's also where you can get direct airport shuttles.
For the money, I really think this is hard to beat. You won't regret it!