Here a general description, Mini. Palermo Chico is essentially the area where a bunch of embassies (and ambassadors' residences) are clumped together; it is on the river side of Libertador, with Plaza Rep de Chile on the south and Av. Jeronimo S. delineating the north, not quite reaching the train tracks at the Saldias station. Palermo Nuevo (which is where I live) is essentially between Libertador, Sarmiento, Santa Fe, and Bullrich. Palermo Hollywood is a section of Palermo Viejo, basically between S. Ortiz, Cordoba, the train tracks along Juan Justo, running into regular Palermo when heading toward Santa Fe. I walk these areas frequently, and this is how I delineate them when walking around. A map might be more detailed and accurate.