The apartment is nice, bright and comfy. We had a great time here. I traveled with my boyfriend, our little baby and two other friends.
It is located next to the gothic quartier, in an area where you can find a lot of coffee shops, bistros, supermarkets, shops and so on. The metro and bus stations are pretty close.
The owners are very prompt and responsive.
On the down side:
This place is more appropriate for a family or couple, 4 adults it is too much. The boiler is not that big, maximum 2 persons in a row can take a not-too-long shower.
I would not recommend to travel here with your baby if he is noise-sensitive, as it is a lot of noise from the cars in the night.
The heating is by A/C, not separate, as I expected from the description.
Overall I would book this place another time in a warm season and if I would travel without my baby.