I signed up for the tour on Viator because i have had good experiences in other cities in the past. Big mistake. This was a large group (almost 30-40 people) and most of them were men. So the gender imbalance was noticeable. No big deal but overall, this was not worth my time or money. It was borderline weird. As a solo traveler, I want the group to be lively and interactive. This group had two fairly large sub-groups 1. a bachelor party and 2. another large group from the States. This was the worst possible thing that could have happened because they were just doing their thing and for those that were not part of these two groups, it was pretty worthless. The guides were ok. They also get drunk and hit on men/women during the crawl at bars. Our guide Paulina was busy giving away her number/instagram to random guys at every bar. She seemed drunk and by the time we went to our last club, i'm pretty sure she was wasted. Anyway, this wasn't a very pleasant experience for me personally. Again,this is just my personal opinion based on my personal experience. Other may have better luck. There are several such bar crawls listed on Viator and I guess its a hit or miss on any given night. Take your chances and who knows, you might get lucky.