Provider first. Then get the room. If she has good review history and contact I guess I assumed gents didn't worry or make "back-ups" with me (you can also request confirmation or email to reconfirm so that IF she flakes, you have the 24 hour cancel window and don't lose the room money, I do try to re-confirm the day before but guess I have not always taken the 24 hour window into account because I don't think I have ever NCNS and as for having to completely miss an appointment I would pay the hotel if he was not already staying there or give a free or reduced session to make up the cost and inconvenience, two way street!) I do many outcalls with local gents, as well as travelers who have a room anyways. I have gone to private homes of single gents and gents I know and trust, saves them money, they might feel more comfy at home, etc. and hotels can get boring (though there is also that element of excitement sneaking off to a hotel for some naughty time 
Depends on level of provider- many gents are wary of incall because lower end providers can them manipulate or harass them with a "pimp." It also may bring you to a shady area w/ more police attention or drug activity. Now if you are seeing a reviewed high-end companion, incalls are considered fairly safe if you do your homework, and it is nice to have the provider have a location set up nicely and romantically, but it's hard to find a good incall if 1) like me, you are part time and don't like to see or cannot see due to schedule, multiple gents a day. Financially it is not worth it. Also having pets needing feedings or walks, can make it hard for a gal to go between incall and a home apartment, and many would not compromise their own privacy by combining business and personal in such a way. 2) Full time providers may still have trouble finding a location that is safe and discreet as far as neighbors, for both herself and her clients. It's easier to be anonymous in a big hotel with a big parking garage, than parked outside a provider's rental, but to some gents it may make no difference! But for both parties, it can also be an issue if neighbors are nosy or walls are thin.. hard to find that perfect incall, but if she's well reviewed and maintains one you can inquire, but she has probably taken the necessary precautions for herself and her clients to feel at ease.
Basically, I do not think it is in/out so much as general quality, safety, and review history of the provider herself.
Although, as stated, some like myself are generally outcall only, and thus gents no matter where they reside do the hotel thing-- it is quite common even for locals.
Hope that helps, enjoy and have fun!
XoXo,
Marea