The only con I can think of is the outside road noise that can sometimes be disturbing, but not to the point of disturbing a good night's sleep. The room is good for 2 people, and 3 kind of pushes the limit.
My stay overall was very nice. Room is clean and Gigi (the host) responds promptly. The place is right next to an MTR exit, which is absolutely a huge plus. Will definitely want to stay here again the next time I'll be in Hong Kong.