How to say "I live at the bottom of a hill"? I've only ever people say something like 我住在山坡上 but to me 山坡 sounds like the side of a mountain. Google translate gives me 我住在山脚下.

In English we use, I live at the bottom of a hill, not I live at the bottom of a mountain or I live on the side of a mountain; mountain sounds too majestic.

So is 山坡 or 山脚 a good choice for side of a hill or is there a better word to describe where I live?

I want to say something like: Because I live at the bottom of a hill it is hard to ride my bike to work. 因为我住在山脚下，骑自行车上班很难。
山, in general, refers to a mountain or a hill.
  
  坡 refers to a slope.
  
  Therefore, 山坡 refers to the side (or slope) of a hill (or mountain).
  
  脚 refers to the foot.
  
  So, 山脚 refers to the foot of a hill (or mountain).


Depending on what bike you are referring to, it could be a motorcycle (摩托车) or bicycle (自行车).

I think the translation provided by Google is okay:


  Because I live at the bottom of a hill it is hard to ride my bike to
  work.
  
  因为我住在山脚下，骑自行车(or 摩托车)上班很难。


If you are staying in a valley, 山谷 will be more appropriate.