It's about a 10-15 minute walk to the station. Unlike the directions mentioned, don't take exit 1 out from Zoshigaya. Take the Meji-Dori exit! You'll save yourself from a bit of a walk outside. Grocery store is very close by, it's also easy to flag down a taxi around there. Our host was too busy to call a taxi for us, so make sure you download the JapnTaxi app before you go to Japan!