Xにしては/Xわりに

Usage

Means "Considering that -" unexpectedly

N のわりに

にしては express the difference between the previous image one has and the reality

田中くんは学生にしてはいいマンシオンに住んでいる。きっと親が金持ちなんだろう Tanaka lives in a nice apartment for a student. His parents must be rich

このアパートは駅からちかいわりに、家賃が安い The rent for this apartment is cheap, considering how close it is to the station