This place is very simple but very clean and safe area. I travelled and stayed here solo, so it was very safe. The beds were SO COMFORTABLE after long days of walking. Also, the heater/air conditioner is great. The apartment is located on the third floor on top of the restaurant. While I was there though, it wasn’t open at all and there seem to be no one else staying in the building.
The staircase (3 flights) up to the room is very narrow- so it may be hard to bring up big luggage.
Otherwise, the location is great. Literally 2 min walk to the subway station, direct line to the Narita Airport, has very good restaurants around/walking distance. I would recommend to stay here for 2 people max as it was small. But the host provides 2 beds.