If you're looking to stay in Shimokitazawa (which you totally should), you can hardly find a better located place: Daisuke's Green apt. is just 1-2 minutes away from the station, but in a totally quiet street.
Daisuke was lovely and helpful. He lives in the area and speaks perfect english, and that definitely can be a lifesaver...
The apartment itself is clean and functional, with the kitchen, bathroom and toilets separated from the living area which is very cool smell-wise. The bed is insanely comfy (memory-foam matress) and the Pocket-Wifi worked wonders.
Shimokita really is an amazing place to hang around. It has everything, but is not over-stimulating and extenuating like the big centers can be. Its small streets still hold a charm that seems to fade away everywhere else. But still it's on two big train line that will get you in minutes to Shibuya or Shinjuku. With the Odakyu line you'll get pretty much anywhere with no transfer.
A great little place to crash, managed by the most helpful guy in the coolest place. You can't miss :)