I tried working with two agencies while in Germany.  The first one http://milleniumescorthamburg.com/ I found to be disorganized and not responsive.  In fact, I would have had to go without had I not had a back up plan.  I contacted then the day before and found out who was available and gave them a location and estimate of when for the next day.  They said no problem.  The next day I contacted them and asked if an earlier time would work.  They said no problem.  Once I got checked in and texted them to confirm they same earlier time I have given them and let them know I was there, no response.  I was using WhatsApp so I could tell they were not even on line reading the messages.  After waiting 30 minutes I contacted a different agency that got back to me quickly, sent me a list of available ladies, then sent who I selected.  Three hours later http://milleniumescorthamburg.com/ contacted me and also got quite hostile when I said I booked with someone else and would mention their not even being on line when I contacted then at the time they should have been expecting me.  From my experience, using this agency seems to be a good way to get stood up.  I recommend avoiding.  It was not only they unresponsiveness, but also their belligerent attitude.  A simple apology or not being on their phone at the expected time would have gone a lot farther with me.

The agency I used instead was http://hamburg-escorts.net/ and I would have to give them a good grade for being responsive.  When I contacted them, they quickly got to setting me up with the lady of my choice.  The session itself I only gave a 7 on performance.  So on performance I have had better experiences with agencies in Belgium and Spain.    But performance is probably more likely to be a function of the lady selected than the agency.  So I might try this agency again when in Germany, but I will probably definitely be avoiding the agency in the first paragraph.