Directions from Keleti train station

You should descend the steps beside the front door and follow the signs for metro line 2 (red line). Go down the first escalator to the ticket booth and machines. You should buy metro transfer tickets (530 forints, comes as two parts) and stamp the first part before decending the second escalator to the platform. Take the metro for one stop, in the direction of Déli palyaudvar, to Blaha Lujza tér.

After ascending the escalator follow the signs for trams 4 and 6 in the direction of Széill Kálmán tér on your right. Take tram 4 or 6 for three stops to Oktogon (stamp the second part of your ticket when you board the tram). The apartment building is a short walk away:

Google maps directions