German to English Other Slang Austrian German

Hi folks.

Working on the memoir of a family friend who was born in Vienna before World War I and has since passed away. She is describing her early memories during WWI. She lived with her uncle while her father was in the army. She had two cousins (girls) who were about the same age. Here is the sentence.

Wir waren immer gleich gekleidet und wurden das "3 Maederlhaus" genannt.

Now, I have heard the term "Frauenzimmer" (used by my mother-in-law to refer to some of my brother-in-law's girlfriends), but never a whole house!

So, what is this referring to? The memoir is sort of written as if she were just talking to someone, so what would be an appropriate translation?

All contributions gratefully accepted.