You will need to be let in by the doorman or someone getting out from the building since the lobby door to the building needs a keycard.
For the door to apartment itself, ask directions for opening and closing the door.
They got a polite dog so no need to worry about the dog as during my stay, I only barely saw and heard the dog.
There is a bus stop right in front of the building and the train stop is about 12-15 mins walk.