noun
A French-style apartment, often implying a somewhat upscale or Western-style flat. Less common than アパート, which typically refers to a simpler Japanese apartment.
from French appartement
彼女はパリのアパルトマンに住んでいる。
She lives in an apartment in Paris.
このアパルトマンは広くて明るい。
This apartment is spacious and bright.