Using MARTA is very easy. The airport station is at the west end of the main terminal, just follow the signs. It's $1.75 each way. Your station will be the Peachtree Center. When you come out of the station you will have a short walk. The Marriott is kind of hidden behind the Westin. Do not confuse the Marriott downtown with the Marriott Marquis, which is also in right downtown in that same area. Your hotel is toward Centennial Olymic Park. The Marquis is the oppisite direction. MARTA has a great web site. Have fun and welcome to Atlatna!