Great place, spacious clean and with everything you need for a long stay, a working kitchen with cooking utencils, cutlery, plates, wine & champagne glass.
The place has an elevator. You don't need to worry about climbing the stairs. The Tatami section is a bit high from the floor so people with knee problems need to be careful.
The balcony in front of the room is great for sitting outside and digesting your day if the weather permitted. It was raining all day when I stayed there so I couldn't really sit outside. You can see the top of skytree from the window.
Will definitely stay here again.
The place is about 10 minute walk from JR and subway station. Take a taxi if you have a lot of luggage.