My friend and I really enjoyed our stay at Keis house.
It is very close to Aoto Station (about 5 min. walk) from where you can get practically anywhere you want to go.
It's located in a quiet neighbourhood, so you can get a good rest at night.
Kei is a very friendly and very helpful guy. When we arrived he immediately invited us to show us around the neighbourhood and to have something to eat and drink with him. He also invited us to join him and a group of freinds at Hanami (party beneath the cherryblossom trees), which was really great.
I can only recommend staying at his house. We'd totally come back.