Value for money but bring your earplugs.
The apartment is small for 4 people with luggage but we managed to get by. It was well equipped with soap, laundry detergent, cutlery and crockery. It is very basic - so don't expect luxury but for the price and area we thought it was ok value for money.
The location to transport is great - 450m to both Yotsuya and Yotsuya-Sanchome stations. Lots of restaurants and convenience stores nearby. Paul's patisserie at Yotsuya station was a peaceful retreat.
The only negative we had about the apartment is that your bedroom is right on Shinjuku-dori so is busy with traffic all night. After the first night we bought some earplugs and we slept soundly for the rest of the week.