Early May, and the Charles takes its slow bend past Allston with shells already out on the water at first light. Mora Landscaping LLC works the lawns on that side of Boston — first cuts of the year, clearing everything winter dropped, edges re-cut where the grass has crept over the walk. Rentals and family houses sit shoulder to shoulder here, and both look better once the mowing settles into a weekly line. Through summer it is trimming, feeding, mulch and steady cuts; through autumn it is leaves, out and gone. A neat lawn is a quiet welcome, and this stretch of the city can use one.