In a district with few sleeping options, Tokyu Stay is a good one, offering compact, newly renovated rooms with a combo washer-dryer and a microwave, very near Gaienmae subway station (Ginza line) and within walking distance of Aoyama. For a small upgrade (¥1000 to ¥2000 per night) get a room with a kitchenette (with a hotplate and sink).