I've stayed at Kiko's house for 4 nights. Overall, it was perfect. Summaries of my stay:
Advantage:
1. Friendly host, responsive and helpful
2. Nearby train station (Honjo-Azumabashi) has a direct train to go to Haneda airport.
3. Train station to Kiko House about 5 mins walking distance
4. Nearby with Sumida park(5 mins), Skytree(10 mins), and the bus stop just a few walk away.
5. Nearest convenience store is 7 eleven.
6. The environment is quite
7. Separated toilet and shower room
Disadvantage:
1. Not suitable for ppl with small kids and old folks due to bed is located at the loft side. Max person suitable is 1 or 2 person.
2. Floor is not heated. Loft area can sometimes be a little stuffy due to insufficient air circulation.
3. Small size (fit 1 adult person) and not really suitable for extra size person or couple with infant or babies.
Overall, I am satisfied with this house. Looking forward to stay in Sumida City on my next visit to Tokyo !