Great location, especially if being close to Haneda is important to you - we had to catch an early morning flight on our last day and were able to get from the house to the airport by subway in about 25 minutes.
We really enjoyed being in Kamata, got to see a side of Tokyo probably not seen by most tourists. It was nice to explore the local shops and eateries, where more often than not we were the only non locals.
Hervey is very friendly and was waiting for us at Keikyu Kamata station even though we only arrived there at 11:00 PM and walked us to the house, taking care of pointing out the local supermarkets and convenience stores and giving us a tour of the house. He was very responsive to my messages with follow up questions.
The house was very clean and the amenities were perfect for our family of 4; it is very close to the Keikyu Kamata station and from there it was easy to get anywhere in Tokyo.
The bedrooms were spacious with plenty of space for our luggage. There were 2 toilets plus a shower room, and soap, shampoo, sealed toothbrushes and toothpaste were all available. The kitchen had all the utensils we needed and then some.
I would gladly stay in one of Harvey's properties again and strongly recommend this house.