If I am a tourist coming from Japan for over 15 days and staying at a hotel do I need a letter?

I am planning to go to Beijing from July 15th to August 31st, I wanted to know whether I need any other documents besides the copy of my passport, photos, itinerary, flight tickets confirmation and the form? I have a Japanese passport and will be staying at a hotel (airbnb). I would not need an invitation letter would I? Thank you