Every budding artist dreams of having their own studio. In the meantime we have to make do with what we've got. If you can cadge a small corner of a room and set up a table where you can leave your art materials out ready for action at any time, then you've made a good start. Some artists prefer to have all their equipment on a taboret or trolley next to them. This leaves the painting table uncluttered, holding just the painting.
Some watercolourists work best standing up, others prefer to sit.
There are no hard and fast rules here. Do what feels most comfortable for you. If you can only paint at night you'll need to carefully consider your lighting situation. Normal domestic electric lighting is called incandescent light . Unfortunately this form of lighting casts a yellowish glow and will distort colours.