If you click on "Walking" and then click the little camera icon, you can actaully drag the little man on the map and see photos of the entire route. Cool!
I have to say though after 'walking' the whole route by camera- I don't see a single hill anywhere. There might be some low 'inclines', but honestly it all looks completely flat to me.

I guess we all see things relative to our own areas. If you find that hilly then I am sure after riding it for a few weeks it will not seem that hard to you anymore- really, your leg muscles will quickly build themselves up to handle that easily with regular riding.
I think your bigger challenge will be the darkness, and for that you should get a really good lighting system on your bike- front and back, and a
strong steady white headlight AND a
strong steady red tail light. Not just 'blinkies'. Also you should have some good quality reflective wear and buy some extra stick-on strips for helmet, backpack, buy spoke reflectors, reflective gloves, etc. Light yourself up like a Xmas tree!
Good for you in wanting to commute by bike! I'd say it's certainly do-able, especially just 3 times a week....just seems daunting at first.