At the smaller end of the scale, you can get 20, 24, or 28-inch sets, some of which are best placed on a desk or counter as a step up from your computer monitor. After that you have the 32 or 36-inch TV, which is compact enough to fit in tighter spaces than its larger counterparts without downsizing too much.
What you gain in convenience, however, you may miss out in additional ports and the overall picture quality. Even 32 inches is too small for a 4K UHD display, meaning you're stuck watching standard HD/SDR quality content at either 720p (1,366 x 768 pixels) or 1080p (1,920 x 1,080 pixels). Most content is in HD/SDR, anyway, so it may not be much of a loss for you – but if you want more from your picture, you may want to jump a few sizes and pixel counts up.