Place is more than we could have asked for and easily one of the best bargains our there. Considering how large, comfy and professional the place is - not to mention its location in the heart of the city - my wife and I thoroughly enjoyed our 1 week stay. Since we were there for work, we had to take VC calls for work in separate rooms, which was not a problem at all. Fast internet connection and setup of the apartment allows people to take calls simultaneously without disruption or noise interference.
Location is a 5 min walk to Kojiya station and about 15 min to Kamata. Tons of convenient stores around. Eims (our host) was super responsive and attended to our every needs.
We will be back to stay at this place without a doubt the next time we come around Tokyo again.