Shohei is a great host, he responds to your queries really quickly and you can get in touch with him anytime. We had a last minute change in our schedule and had to depart Tokyo a night early and he generously altered our reservation so we could get a refund.
His place is, to me, a great place. It is in between two stations; Daitabashi and Sasazuke. Both are on the Keio line and is quick to Shinjuku as it is only one or two stations (depending on where you take it from). There are plenty of eateries on the way to the location so if you're coming back after a pretty late night and need something to munch on the way to bed, this is the perfect location.
Definitely recommended to stay - the place we had was good for 2 adults (if you have too many things, you will find it a bit small for your taste)