My simple thoughts.

Large, lots of entrances (exits), parking free or affordable.  
Incall: mirrors and a sex swing.  
Laundry in apt it cheap within the building.  
Xxo,
SG

One could make a good argument for or against any location. I believe what matters most is to act like you have been there before and that you belong. Some providers make give clear directions on what to do and what not to do. For example don't stand around the outside of their location waiting to be let in or buzzed in. Just blend in so not to attract any attention to them or you.

When client arrive at an apartment or hotel room, give them the room number and instruct them to enter without knocking. Neighbors hearing doors being knocked attracts extra attention.

I found the key and let myself in and when I opened the door, she was on the bed masturbating and started begging me to get inside her.  That was one outstanding incall appointment!

Apartments/Condos have secure entries, plenty of free parking, many visitors that don't live there 'buzzing in' and few have cameras and only at entries. Hotels have cameras all over, from parking lots, entries and hallways and keycards and a bored security person can track provider and clients every in/out with time stamped video. Plus easier for LE sting using same info and you don't even know big brother is watching! Some providers rent small efficiency apt. just for business and live somewhere else. Now that's discreet! And in suburb with easy freeway access.

then would be a mid level hotel. no flea bag hotel and no very high end hotels where I wouldn't fit in without a suit or need a room key to use the elevator.