
Answer: Charles Hotel
"When nature calls in Harvard Square, many visitors head to the public facilities in the basement of the Garage shopping mall, which are passably clean but often padlocked at night. To avoid frustration — and to pamper yourself a little — head instead to the facilities at the Charles, which feature marble sinks and cloth hand towels," Nobel writes.
Charles Hotel, 1 Bennett St., Cambridge — Harvard Square
(Jessica Sharp for the Boston Globe)

