I think it's a very good variant for that money.
The flat is tiny, but the location is super.
For 4 big people it is too small, but it is equipped with everything that is neccessary, including a washing maching with drying.
It is not a room at a hotel, so you won't find it perfectly clean. It looks like a place your friend let you stay at. There isn't much space for a suitcase or clothes, but you can cook everything you want in your own kitchen. If you are travelling with small kids, it is not safe for them to sleep on the upper beds. It's better to have them beside you on the lower bed, it's rather wide.
There is the river Seine just in 2 steps from the flat, and several bus stops and metro stations nearby you can choose from.
Carrefour supermarket is in 10-minute walking distance. A lot of cafes and restaurants are around the corner, but it's so quiet in the flat because the house has an inner yard.