The ways to reach the Apartments of Singerstraße:

By plane:

Take the CAT (City Airport Train), then by Underground (Linie U3 in direction Ottakring) 2 stops to Stephansplatz, then turn left to Singerstraße.

www.cityairporttrain.at

By train:

From Westbahnhof (west railway station):
from „westbahnhof“: by Underground  (U3 Richtung Simmering), to Stephansplatz, then turn left to Singerstraße.

From Südbahnhof (south railway station): 
by  Underground (U1 Südtirolerplatz in direction Leopoldau) to Stephansplatz, then turn left to Singerstraße.

www.wienerlinien.at

By car:

From south: (Südautobahn A2):
direction Zentrum to Uraniabrücke, left on Ringstraße to Gartenbau Kino > Liebenberggasse and > Seilerstätte to Singerstraße

From west: (Westautobahn A1):
direction Zentrum, take Schwarzenbergplatz then Lothringerstraße to Johannesgasse > Schellinggasse > Liebenberggasse > Seilerstätte to Singerstraße.

Routenplaner (Google-Maps)