Use this to your advantage, and position the mic in such a way as the sources of noise (keyboard, etc) are behind the microphone, where it is designed to reject them. Notice in the drawing above the microphone picks up sound from the front and from the sides, but rejects sound from the pack. Making these pickup patterns relies on a lot of acoustic trickery, and as a result, the patterns aren't perfect. In your case, you have a "cardioid" microphone, meaning it picks up sound in a heart-like shape. To try and control what sounds go into a microphone, they are designed to pick up sound from one direction better than another. That does not mean that a condenser mic is useless in situations where there is background noise, however. Condenser mics are inherently more sensitive than their dynamic counterparts, but that just means they won't need to be turned up as loud to give usable volume (IE, they produce a larger output signal with less gain).
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