My spouse & I stayed during shoulder season / low season. The apartment is super cute and has great gadgets (cooking, nespresso, TV, etc). Unfortunately, the building's heat was off and we were not notified until after booking & payment, so the concierge sent a space heater that we had to set up ourselves. Also, all of the overhead lighting in the kitchen and living area did not work (which we were notified of close to arrival), so an electrician came by at 8:30PM. It wasn't able to be fixed during our stay, but wasn't that big of a deal.
Overall, I think this apartment is a great place to stay when it's fully functional, but I wish that we had known that upon booking. Maybe we'll try again in high season (Winter or Summer).