Nestled a block from Riverside Park in the heart of the Upper West Side, this lovely 1-bedroom, 1-bathroom co-op is a portrait of modern pre-war charm.     A thoughtful layout maximizes living and entertaining space while keeping the bedroom quiet and private. Residents are welcomed by a formal foyer that flows into a large gallery with a coat closet and plenty of room for a credenza or shoe bench. Beautiful dark hardwood floors run throughout.    The open-concept living room, dining room, and kitchen spans over 20 feet long. The kitchen is adorned with a large eat-in island, sleek stone countertops, and stainless steel appliances. Elegant French doors lead into a tranquil bedroom with a deep closet and windowed en-suite bathroom. The bathroom is well-appointed with classic fixtures and finishes like white subway tile walls, basket-weave tile floors, a pedestal sink, and a deep tub with overhead and handheld showerheads.      590 West End Avenue is a desirable pre-war co-op designed by Neville & Bagge. A classy Italianate fa ade gives way to a gorgeous lobby with full-time door attendants. The building has a resident super, a porter, low maintenance costs, shared laundry in the basement, a bicycle room, and a waitlist for private storage. It is moments from restaurants, bars, cafes, and shops like Carmine's, Amelie, and Jacob's Pickles. Riverside Park and Central Park are minutes away, and nearby subway lines include the 1, 2, 3, B, and C. Pets and pieds-a-terre are welcome.