I recently stayed at First Cabin Haneda Terminal 1 before an early morning flight. The facilities were clean and well-maintained, offering a comfortable place to rest. The shared amenities, including the public bath, were a nice touch and helped me relax before my journey. 
However, I found it inconvenient that there’s no similar accommodation in Terminal 3, where my international flight was departing. Transporting my luggage from Terminal 3 to Terminal 1 late at night, and then back again early in the morning, was cumbersome and time-consuming. Having a capsule hotel option within Terminal 3 would greatly enhance convenience for international travelers.
Overall, while First Cabin in Terminal 1 provides a good rest spot, the lack of similar facilities in Terminal 3 is a notable drawback for those with international flights.
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