The main characteristics to look for are:
| · | Absolute silence
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| · | Room geometry
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You may have to experiment to find a suitable location. Try to find a reasonably soundproof area in your office so that outside noises and PC-hum is eliminated entirely (or at least drastically minimized). All spurious sounds will otherwise end up recorded in your prompts.
The size and geometry of the recording room, and the way it is furnished, have an important impact on the perceived quality of your recordings. The resulting impression can go from cathedral-like reverberation to a "locked-up-in-a-wardrobe" kind of sound. Find a reasonable compromise. If you cannot find a suitable studio your microphone will have to be extremely directional. If you cannot afford one of those, get the recording work done by a professional studio. For more information, look in the chapter on tips and techniques.