We loved this flat and enjoyed using it. Cleanliness etc was impeccable, and it was more spacious than other reviews had led us to believe.
The only issue we faced was the concierge being away from her desk when we came back late at night... we rang and rang but it took her 20 minutes to come and let us in. Given the lateness of the hour, it's kind of understandable
she wasn't on constant alert, but having no independent access to the street entrance in that situation was a tad frustrating. That's the only area for improvement in an otherwise great setup.