Benefits: Futon sleeping feels great for my back. Walking distance to a few different metro stations and Yoyogi park, which is beautiful. The neighborhood is peaceful but still very accessible to many nice restaurants, cafes, and bars. Shibuya Station is approx a 20 min walk away.
Downsides: No elevator. The space is very small, ceiling just barely fit my 183cm/5'11 friend. I had a slight allergic reaction while in the apartment (possibly from dust), runny nose/coughing, but manageable for a few days. It is located above a bar, so some noise can be heard but did not prevent us from sleeping.
Overall had a satisfying stay!