A block from Central Park, in the perfect Carnegie Hill location, this fabulous 9 room home has been renovated to perfection. A sophisticated gallery opens on to a grand scaled living room with a wood burning fireplace and an elegant formal dining room. Both south facing rooms have oversized single pane windows allowing sun to stream in all day. The handsome corner library features views of Central Park, custom millwork, a wet bar, and a full bath which can be used as a powder room. This sweep of impressive rooms allows for fabulous entertaining as well as comfortable living.    A gracious serving pantry leads you to the gorgeous, windowed chef's kitchen. There is a lovely eat in area, custom cabinetry, top of the line appliances, natural stone countertops and ample storage throughout. Completing this space is a vented full size washer dryer.    There are two cheery bedrooms on the East side of this home, both with excellent closets and ensuite baths. The separate master suite has tremendous closet space and the most luxurious, windowed ensuite marble bath featuring a double vanity, soaking tub, separate shower and storage. A fourth bedroom overlooking Madison Avenue is adjacent to the library and shares its bath.    Throughout this sun-flooded home are wood floors, new tilt and turn windows, a Sonos sound system, central and thru-wall air conditioning, high ceilings and excellent storage.    49 East 86th Street is a white-glove, full service, prewar cooperative.