The FitDesk company has sit-to-stand desks, under-the-desk ellipticals, and bike desks. I use my FitBike almost daily for reading, watching webinars, and processing emails. It folds up easily, so it doesn't take up much space. The rubberized desk keeps my laptop from sliding.
This bike isn't meant to get a sweaty workout on; it's meant for movement. I switched out my seat to one that is more comfortable for me and have moved it around to my screened-in porch during the nicer months.
To buy from the Fit Desk, use code MARCEYFREEMAT to receive a free mat on all bikes, under desk products, and desks!