Is it a good idea to keep a coffeemaker if I only occasionally drink coffee? Say just two or three cups of coffee per week. Is cleaning these a trouble?
Cleaning is a hassle, sure. But something else to consider is the recurring cost of the coffee itself. Where I live, a bag of coffee costs almost as much as a coffee maker. Cheap coffee makers can be found for as little as $10 - $20. Small French presses are around $20 to $30. 

According to wikipedia:


  A customary "cup" of coffee in the U.S. is usually defined as 4 fluid ounces, which is the commonly used as the measure for an amount of coffee.


So if you really mean just a few "cups" per week, then it might not be worth it to buy a coffee maker, because your bagged coffee will probably get stale before you can even use it all. Just grab a drink from your local coffee shop occasionally.