Hong is very responsive, and even shared information about metro closures the morning I checked out -- which I would not have been aware of otherwise!
His place is on the 6th floor, so lots of stairs, but I loved the charm of the building and the apartment was the perfect place for me to wind down at night after a full day of enjoying the city! It's also VERY close to the nearest metro station and if you like walking, the Louvre, Arc de Triomphe, and Eiffel Tower are within decent walking distance. I even walked to Montmartre and Notre Dame, though a bit further.
I would DEFINITELY stay here again!