A conveniently located place with everything you need to rest comfortably after a day of exploration.
(Bring earplugs as the neighbors are first-class assholes who will have parties all night, scream, laugh, move the furniture, make a ton of noise, and ring the door buzzer in your apartment at 2 o'clock at night even though they are trying to get into a different apartment. The walls do nothing to muffle all this racket.)