We have stayed at Lex’s house with our 3 young daughters. The house is really nice: great design, close to Yoyogi Park where you can rent bicycles and also close to some good cafes (try Bondi park cafe for breakfast). There are 3 subway stations near the house (about 10-15 minutes walk) and it’s easy to go to different parts of Tokyo from here. Lex is a great host, he was always answering promptly to all our questions and we felt very much welcomed in his house.