Dusk Tactics
Assault Basic
For assault, a very effective tactic would be to have a sniper wait and watch from the balcony, the VIP will normally have to run across the door from the other side of the alley. Another approach would be to rush all the buildings surrounding the immediate area of the extraction point pinning down the enemy before they can reinforce it. My tip for assault would be to spread out as much as possible and cover as much ground as you can because the Escort team can pop out of any alley at any moment.
Defense Basic
The best probable strategy is to run for the VIP first and make sure he gets back with you alive, then run for the arches by the main road. if you can secure that area and suppress assault long enough to sneak in a couple troops behind the building, you are sure to get the VIP out. Always make sure to leave at least two units to protect the VIP while you flush the assault team out from hiding.
A tip for escort is to never let the VIP out of your sight. There are alot of places to hide on this map and anyone of them, especially the road next to the extraction point, is easily rushed and defended by assaulters.
General Tip
Always make sure that you have someone make sure that every single pathway and alley around the extraction point is clear before moving it. This area is most likely to be rushed by both sides. If you can secure these areas first, you already have the winning advantage, but that is if you maintain communication and teamwork with your team.
This is quite a simple design for a map. There are only a few major roads, but there are alot of windows, doors, and other places to hide in. Always make sure to check every one of them before moving in, especially for escort team and the VIP.
In this map, taking things slowly isn't as important. With narrow alleys and corridors, normal walking speed is preferable, unless you would prefer to use stealth to your advantage. The main idea on the other hand is to gain control of as many vantage points around the extraction poins as fast as possible. Having control of the immediate area around the extraction point can mean certain victory, unless your team makes a mistake by moving out of the area and letting the other team in.