Unbeatably close to Roppongi Midtown, and an underground walk to Roppongi Station is very convenient during the cold weather. The apartment is big enough for 2 adults and 2 toddlers to stay for 11 days comfortably.
The close proximity to midtown allowed us to buy takeout quickly and feed the kids at home when needed. Also, the midtown playground is an easy walk and the kids enjoyed some outdoor time even in the cold weather. Early risers with kids can also find kid-friendly breakfast at Le Pain Quotidien, Dean and Deluca, Blue Bottle coffee etc. A popular ramen joint called Iruca is literally 10 seconds walk from the apartment.
The only minor complaint is that there is only a washing machine with no dryer, so you have to be a little creative with how to dry your clothes. There's a drying rack on the balcony but it is also where you keep your garbage.
Overall we had a great stay, would stay here again if we visit Tokyo!