My fiancé and I stayed at Derek's place in Hiro-o over the Christmas break and loved it. The apartment is in arguably the best part of Tokyo to be in -- immediately outside the main street of Hiro-o with tons of options for food and drink literally seconds away from the doorstep -- and within walking distance of places like Ebisu and Azabu. The apartment itself is perfectly sized for a couple and could even fit another person or two comfortably, though at that point restrooms might be an issue, as there's only one toilet and one shower. Otherwise, it has all the amenities you need, is cozy and comfortable, and again, it's hard to imagine a better location for any place in Tokyo. Looking forward to staying there again in the near future.