The apartment is in a great location - you can stroll into the heart of Shinjuku in 10-15 minutes and there is a train station just around the corner too.
David is a great host and was so accommodating; my boyfriend was really sick and I had been out multiple times in the day to get medicine and food etc. When it came time for dinner, I didn't want to face the rain again. Upon telling David this, he offered to pickup food for me. He went way above and beyond! He also offered to pickup medication and anything else we needed. So lovely!
The apartment we stayed in was a bit small itself (a trend in Japan though really) but is adequate for 2 people with small suitcases.
I would recommend David's place if you're after something with a convenient location. And David is a great host!