You can take Kuo-Kuang Bus no.61 to Taipei Main Station where you can take MRT for one stop to Ximen station and walk here.
P.S: In Taiwan, address numbers can be very different from other countries, for example #1,3,5,7,9(odd) are on one side and #2,4,6,8 (even) are on the opposite side. So please take note when looking for our address!