For context, we were a total of 4: 2 adults and 2 kids (4 and 2 years old).
Adults slept in the main bedroom and kids in the couch-bed, which we engaged and disengaged every day without any problem (Mikael provided very good instructions, even it's not rocket science!). We also have seen a folding baby cradle in the main bedroom that we didn't use.
The area has a lot of surrounding restaurants and bars, so you can either have breakfast/lunch/dinner at home, cooking at the small kitchen, order something for take away, or just hang around and eat outside. Despite the streets have a lot of activity during the evenings, the windows are very good (double glass) and isolate noise perfectly. The main bedroom window communicates with an interior area and there are no noises or smells. We visited during summer and this allowed us to keep the window open to refresh the room without major problem.
The apartment is like in the photos (and typical Parisian city center apartment), and it's properly maintained and clean. The bathrooms, something we pay special attention to, were very clean, as well as the kitchen. The internet connection was stable and fast, and we were able to enjoy streaming services during our rest time at the apartment.
Overall, I recommend this flat for 1-2 adults, and a maximum of 2 kids that can sleep together in the couch-bed. I think it provides great value for money given the median prices of Paris, and more importantly, of that area of the city close to Bastilles square.
Mikael was not intrusive. Reached out before check-in and before check-out to make sure we didn't have any problems during the process, and took charge of picking some gifts we forgot in the apartment, which be always grateful for.