Stayed at the same Airbnb on Calle 9 from my last trip. No issue with bringing girls back at any hour. Just had to make sure they had ID for the security desk at the entrance. It's a bit of a walk from Playa Hollywood so if you don't like to work up a sweat walking back and forth stay closer to Calle 4.
Playa Hollywood during the daytime. Girls were asking for 250 k to 400 k for 1 hour. 4 pm had the most girls. 2 pm if you want dibs on the girl of your choice.
Torre del reloj at night. Girls start hanging around the plaza at 10 pm up to at least 2 am. I was usually on my way to bed by 2 am so not sure if the action went on later. 12 am has the most girls in the plaza, clubs and outside the clubs. Girls outside the clubs and in the plaza were asking for 250 k to 500 k for 1 hour. Lots of cops in the plaza and near the clubs so it was very safe up to around 1 am. Uber was super cheap. Otherwise taxis were 10 k to 20 k.
At the end of the street by DV there's a bakery and you can sit there and watch the girls snack or arrive in taxis for DV all night long. If you want first dibs on the girls before they go into the clubs, that's a good spot to catch them when they get dropped off by the taxis. Inferno / Imperium is also a quiet club with strong AC if you want a less crowded club. The girls from the plaza like to go in there for the AC and bathroom too.
Davieneda ATMs in Bocagrande worked fine and gave out 1. 8 M at a time with no fee. Make sure to say no to the conversion.
I had no problem finding light skinned skinny blonde 20 yos and tanned curvy brunettes. Picked up 10 Venezuelans. 5 locals and 5 paisas. Called a few girls on Whatsapp for 200 k to 300 k but their photos were heavily edited. Playa Hollywood and the Plaza worked best for me. Cartagena is still fun and relatively cheap. Lots of girls in lots of venues and new girls arrive daily.
