Itoe's place is well laid out, well-appointed and clean - a fairly typical newer Japanese apartment of a decent size. It was perfect for a couple of nights with our two young children.
The location is great! Shimbashi is a largely a salarymen area, so there are tons of places to eat and hang out in the evenings. The place is a short walk from the Hibya exit of Shimbashi station, straight through a shotengai sort of area. While there isn't much for kids in Shimbashi, the proximity of the station(s) makes getting out quick and easy.
Itoe was very responsive and accommodating as a host. We'll definitely look for Itoe's place(s) again the next time we're looking for a weekend in Tokyo.