This is a great place for a stay in Tokyo. It's near the JR Hirai station. Easy to get to from Narita and handy to explore the rest of Tokyo. We got lost trying to find it the first night though but it's not that hard if you have google maps. We just weren't able to get access to wifi at McDonald's like Mariko suggested. However Mariko came along to help us when I got a few seconds of wifi access and able to send her a message.
All you have to do is turn right as you come out of the station, walk past the police box where you will also see McDonald's on your left and keep walking straight until you see Daiso. At Daiso turn right into the street opposite, walk about 500 metres and you will see the apartment on your right near corner intersection.