While I love the Marriott SpringHill at ATL Airport.....getting there means going from baggage claim, outside the terminal, across street, up escalators to the elevated tram, just a 5 min ride on tram, then down an elevator, walk maybe 25 yrads to hotel door for either Marriott SpringHill or full-service Marriott......... maybe that's more trouble with kids/baggage/pram........ so perhaps consider whether it's more convenient with family & stuff to get into a taxi just outside baggage claim and be driven to the front door of a hotel.

There are dozens of hotels within a 10-min taxi ride of ATL airport (and at 11pm, downtown Atlanta will be within a 15min-20 min taxi ride)...... near airport perhaps consider a suite-type hotel which will have some kitchen facilities...... the Marriott Residence Inn is reliable, I find. Cheers!