Stapleton yards are small and stubborn — terraced into the slope, hemmed by retaining walls, half sun and half shadow by two in the afternoon. Calixto Landscaping Inc gives them lawn care sized to fit: mowing and edging in tight quarters, string trimming along the wall lines, hedge and shrub trimming, mulch, cleanups spring and fall. A little yard done carefully reads bigger than it is, and that is a trick worth having. Down the hill the harbor traffic keeps sliding past the foot of the street while the trimmer runs. The crew covers Stapleton, Clifton and the blocks above Bay Street.