Tokyo Metropolitan Gymnasium

For the price and location, I would give it 5/5. It is easily accessible and English friendly. The locker rooms were very clean and well kept. The weight room unfortunately is very cramped and can become crowded, hence the 4/5. Be sure to bring your own towel and a pair of workout shoes. The waiting system is a bit tedious, so if you have a set plan for a workout, you may not be able to follow your schedule to do what you need to do to to availability issues. Nonetheless, there are other machines and free-weights to use so you can still get some of your workout in.

Pov: you came from haikyu

Well equipped. Weight room is very crowded and you have to reserve a time slot at the gym for easy Choice piece of equipment. Must bring workout shies that are clean and not used outside. Bring your own towels, shampoo, soap, etc. Cost is 650 yen for 2.5 hours maximum. Buy a ticket from the vending machine near the information desk. (There are cheaper options around Tokyo which may not have as many people and equipment.)

Decent equipment. Every staff member I ran into speaks good English. Better than receptionists of most hotels. 600 yen single entrance ticket.

Decent gym to train at. Easy for travelers as no sign up required and English speaking staff available. However it's relatively expensive at 600 yen compared to other community gyms around, and can be incredibly crowded. There is a huge variety and number of machines (cardio and weight) but the free weight section is rather limited for a gym of this size and with this many customers. Meaning at times it can be difficult to get into a groove because of the constant waiting.