Our stay in Shimokitazawa was excellent. Location perfect - heaps of stuff to do in Shimokitazawa, but not as crazy busy as other areas of Tokyo (although they are all within a couple of stops on the subway!). The apartment was clean and very functional - kitchen/washing machine and balcony were all very useful.
Daisuke was an excellent host - checkin and checkout was a breeze, and he was available to answer any queries we had.
He was very accommodating as we were travelling overseas with our 9 month old bub for the first time, and was very helpful... unfortunately we didn't get to meet up, so will have to come back to do that!