Now the practicalities. Condensation is caused from the water droplets in the air hitting the coldest surface in a room, which tends to be the window pane (worse on single glazed windows).
Prevent condensation by ensuring there is good ventilation to reduce the moisture in the air, keep lids on when boiling pans and use your extractor fan.
If there is too much direct sunlight or heat try top down/bottom up blinds to help manage solar gain as the sun moves through the day (so no one complains about having the hot seat). If you do have a south-facing window, consider Duette® that can keep out the effects of full glare and thermal gain.