This is a charming studio in a lovely old building. It's well located with several metro lines close by. It is just as atmospheric and pretty as it looks in the pictures.
We stayed here for just under a week as a family of four (two adults and two kids, 7 and 11). While the apartment does have 4 beds, it is, as is obvious from the photos, just one room. This can make it hard to manage things like separate bedtimes for adults and kids. We didn't give this enough thought before we booked and is worth considering if you have young kids or or guests who want privacy.
We were also there during a hot spell and it could be quite hot to sleep in, (not uncommon I think in Paris), although there is a fan that helps.
Overall this is a lovely character filled studio which would make a good base for Your holiday in Paris. A couple would find it delightful; a larger group might want to think about how much space they need for a truly relaxing holiday.