It was one of the best experiences I had in Airbnb. The host Shohei is a super nice guy, met me at the station and walk through. Sasazuka station is very close to Shinjuku approx 4mins. by train, there also buses for Shibuya right in front of the main road. Sasazuka area itself is a nice place with it's own crowd and plenty of eateries.
House was brand new with everything in it also brand new. Very modern nice place, Bed was comfy, shower and bath is perfect with automatic heater, washing machine, rice cooker etc. everyrything is new and clean. There is also a big kotatsu which is perfect for winter.
Shohei was always fast with answers to mails which was helpful.
All in all I strongly recommend this place, I was travelling alone but it is perfect for 2-3 guests I guess.
Thanks for everything, I'll definitely stay again.