The ornamental design for a coffeetable, as shown and described.
FIG. 1 is a top, front, right side perspective view of a coffee table showing my new design;
FIG. 2 is a rear elevational view thereof, the front elevational view being a mirror image thereof;
FIG. 3 is a left side elevational view thereof, the right side elevational view being a mirror image thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is a top, front, right side perspective view of a second embodiment of a coffee table shown with a symbolic break in its length, that being the only difference from the embodiment shown in FIGS. 1-5. Any portion of the coffee table between the break lines forms no part of the claimed design.