[header] How to decorate a sunroom [title] Provide comfortable seating. [step] Individual chairs can be situated close together to promote an intimate atmosphere. A couple cushioned benches may be more practical in terms of space for sunrooms that see a lot of traffic. 
If you lean more towards leisure, you might include a plush chaise lounge or cottage-style daybed in addition to your more casual pieces. [substeps] Make sure there's enough seating to accommodate half a dozen or so people if you plan on doing any entertaining.