It doesn't have to be a soundproof room, but there are certain noises that are highly distracting, and they should be avoided. Music and talking are about the worst. The mind tends to be sucked in by these sounds in an uncontrollable manner, and there goes your concentration. There are certain traditional aids that you can employ to set the proper mood. A darkened room with a candle is nice.
Incense is nice.
A little bell to start and end your sessions is nice. These are paraphernalia, though. They provide encouragement to some people, but they are by no means essential to the practice. You will probably find it helpful to sit in the same place each time. A special spot reserved for meditation and nothing else is an aid for most people.