A sketch is the result of the eye's amazing range of sensitivity, and the mind's powerful ability to integrate and interpret. The atmosphere which blankets us greatly influences our view of the universe. Weather conditions, too, play an important role in the quality of observing. Not to forget the growing problem of light pollution. Some of these complex topics are discussed here.
Observers are full of stuff - gadgets, tools, accessories and other widgets.
The 'Equipment' link takes you to an index of magazine articles discussing this aspect of the hobby. When selecting an observing site, various criteria should be considered. I've collected the points of view of a few authors, summarising the properties they think are important. My feeling is that convenience and comfort should be carefully considered. The quicker and easier you can observe, the more often you'll do it.