Reviews consistently praise Simply Jazz for its live jazz, inviting ambience, and solid food and drinks, with the Keppel and CHIJMES locations highlighted. Patrons value the intimate, relaxed setting, attentive staff, and strong performances, often describing the experience as worth returning for. Occasional issues include reservations and seating problems, long food waits, loud crowds, and occasional service hiccups. Overall, it is regarded as a premier, reasonably priced jazz venue with great atmosphere and dependable music.