At the moment, a bounding box must be given by user to download data. Some users expressed the wish to download data at a given point and its surroundings, which then requires to compute the coordinates at a given distance around the point of interest.
This could be implemented in earthspy by downloading given bounding_box a list of two values (corresponding to the coordinates of a point) instead of 4 (the 4 coordinates of the bounding box) and a new optional argument for the distance around point. If distance equals 0 (default), only return the very pixel.