Go by your first impressions and walk if you have to, if the place is a slum,if the girl is ugly in real life and not like her pics then it better to walk sooner rather then later. I have walked just after saying hello with the "ah I forgot my wallet". Remember you will never see this person again anyway, even if it's a bit rude it's better to walk then go through a punt you know you won't like, it never gets better.
Even if you built up for a few days for the punt, you can always go on AW and find another girl in a few hours
Never be shy to detail everything in graphic detail of you want via email or the phone. Everytime I listed in detail what I wanted it's always been delivered. There is less akward "shall I ask or will I be pushy" moment.
Don't let the talk or massage in between pops delay another round, best way to initiate another round is to gently take her hand (as you are talking or being given a massage) and put it on your dick, this always leads to stroking and round 2