1. Some girls only do out call to HOTEL, so there's a potential risk for you.
I've occasionally read a sadly review on aw, a guy who booked a girl on 14/02 (Valentine's day) in a nice hotel which costs him 200+ pounds, however the girl was sicked and cancelled the booking at the very last minute, so you know there's no refund for the hotel and that guy can only chose to stay alone or get plan B.
So, try to make sure that the Hotel can give you fully or partly refund, otherwise you may face potential lost. Or you can persuade the wg to visit you at your flat (I've convinced a girl who's only doing out call Hotel to visit to my flat).
2. Check her pics, services and any extra before booking.
Some girls came to your Hotel/Home but provide limited services (like no owo, anal etc., but those services on their info and enjoy lists).
Meanwhile, check the Travel Expense. Some girls do charge travel expense (10-30+ vary on distance, normally those wgs will try to charge higher travel expense despite they're pretty close to you).
So if you forget to check these and you're unluckily got a dishonest wg, then you may choose to pay her travel expense to let her 'walk away' or accept her limited services which will not make you happy.
Also check with the girl to see if she's accurate with her pics, if she said yes but show up with a different person, then you don't need to pay her travel expense.
3. Do not give her fully address no matter of Hotel/Home.
If you book her at hotel, just tell the reception that you will have a 'visitor', but don't allow them to expose any details of you to the 'visitor'. You can tell the wg about your hotel address, when she arrived, phone and give her your room number.
If you book her at your flat, you'd better only tell her the closest tube station, you can meet her at the station or any buildings which close to your flat, but do not give her your full address.
Pros for out call:
1. You will have exactly 1 hour (normally over 1 hour). You can ask the wg to come 10-15 mins earlier, so that she can get enough time to reach your place and take a quick shower, you can go with her
2. It's your place and you will get fully control, you can create a romantic atmosphere if you keen on the GFE, or prepare a large mirror or something to make better experience on PSE.
Cons for out call:
1. If you decide to let the girl visit to your flat, then you need to provide water, clean towel and bed sheets. (also you need to wash the towel and bed sheets after finishing the session).
2. If you make Hotel booking, you may face potential lost, and also be aware of any scam or hidden cost, these will happen as same with out calls. So you'd better to choose those girls with nice fb on both aw and UKP.
3. Personal details may expose somewhat. Just try to be careful.
Hope these can give you a help somewhat.