This is a question for providers who have incall locations, or guys who GO to incall locations.  

She could have answered your questions because she knew everything.
Seriously, these are questions that really belong on the Newbie Board and they've all been asked and answered a million times.
Briefly, there's no such thing as the "best type."  It depends on what you like and what her rate is.  Some guys like to go to her apt.  Others feel safer in a hotel.  Nice hotels are better than fleabags but if you go with a cut-rate girl that's all you can expect.  Only use a hotel with a real lobby, not a motel where the rooms open onto a parking area.
Make a good first impression by arriving clean, being respectful and bringing a full wallet.
I could go on.

But  anyhoo, I was guessing that HS was a gal, not a guy, and is interested because she wants to attract good clientele.

But whatever the story is, you make good points.

Basically try to avoid any kind of apartment where you live there, because it can be dangerous for you if some guy becomes a stalker.  Also you may get evicted if the neighbors get wise and complain to the landlord.  LE might even get called in.

A time share at a nudist resort however would be ideal.  Don't laugh, I know someone who had one down in Florida.

She heard every Rosh Hashanah they blow the chauffeur.

yes beside clean: clutter-free, smell good, not too bright, not too dark, not too cold, not too hot, TV not on, soft music or silence...

Minimal foot traffic is nice but really, when was the last time you gave half a shit what someone you saw walking down a street or hall was doing?  Most of my incalls are at hotels but two residential visits stand out: one was a very secluded massage studio, no adjoining walls so we could be nice and loud...the other was below street level with a door code, nice clean place and I never saw another soul going or coming.  The more unseen I can be, the better!

It is like asking what is a good looking women look like

Safety, discrete parking and good location are always important, but for a GFE I would want it to look like a regular apartment, looking like a girl's bedroom.  For a PSE, it should be more plain "accessorized" with some sex toys and for a Domme, it should be "dungeonized" and darker.

I have a place for incall I just want more tips on how to keep it presentable (of course it's clean and clutter free) but I would love it to be a bit more romantic but also worried about parking simply not being discreet enough. Thanks for all the awesome feedback!

Less is more. Everyone is different, but clean and clutter free is a way to go imo.  Maybe throw in a dimmer light switch. Don't want to make it feel too artificial, candles are cool and all but I don’t need more reminders that this is just a “work” place.  

is in a legal brothel so I am biased.  I think it is the best safety wise because you don't have to worry about being arrested and having your life ruined or being ripped off or attacked by a thug.