Madoka's House

Front view of Madoka's House

Madoka's House is where Madoka Kaname lives, along with her mother Junko Kaname, father Tomohisa Kaname and younger brother Tatsuya Kaname.
The architectural design may have been influenced by glass houses or other modern home designs of significance, such as the Nested House N, depicted in the image below.

Madoka's Room

Image of Madoka's room from the OP.

Within Madoka's room there are stuffed animals that look similar to Kyuubey and the other Mahou Shoujo in the series. The similarities of the stuffed animals here leads to much speculation.