Kimpton Nine Zero, a 190-room boutique hotel on Tremont Street in Boston, recently unveiled a $12 million renovation that its general manager hopes will prove innovative in the city's hotel market. At the newly renovated hotel, a painting of a dapper Boston terrier greets guests, meeting rooms are named after famed Boston leaders and the 1,065-square-foot penthouse suite features a headboard scripted with love letters between John and Abigail Adams. The hotel's 2,400-square-foot private...