Why would you choose to stay in that area when you are there for a whole week!!? No way would I,, there are tons of nicer places to stay( nicer areas I mean) and you are going to be all over the place anyways.. so why there.. yech. I get that somenone only staying one night ( so in transit) might choose to stay near the station,, but you have a whole week!
And why not take the metro??It is fast and easy,, and cheap.. and I assume you will pack light ,, I managed to take the RER and metro to get to my hotel and I am a middleaged woman( who went solo),, so there is no reason you couldn't
Look at Hotel Des Mines, Hotel Eugenie, Hotel Diana, and HOtel du College Du France,, all are well reviewed( but basic,, budget places, all clean and well located though) .
Check out hotel reviews by just googling a hotel name and word "review",, tripadvisors reviews are good.