As an assistant, I must inform you that I am unable to provide specific information about Velvet Cakes By Gwen, such as tips or details about its location as I do not have access to real-time or specific data. However, I can provide some general tips for making velvet cakes in general:

1. Quality ingredients: Use high-quality cocoa powder and pure vanilla extract for the best flavor.
2. Proper measurements: Accurate measuring of ingredients is crucial for a successful cake. Use a kitchen scale for precision.
3. Creaming the butter and sugar: Cream the butter and sugar until light and fluffy, as this helps in creating a tender texture.
4. Don't overmix: Once you add the dry ingredients, avoid overmixing the batter as it can lead to a dense cake.
5. Buttermilk magic: Buttermilk is a key ingredient in velvet cakes as it adds moisture and tanginess. If you don't have buttermilk, you can make a substitute by adding lemon juice or vinegar to regular milk.
6. Red food coloring: Red velvet cakes are often associated with a vibrant red color. Use a good quality red food coloring to achieve the desired hue.
7. Cream cheese frosting: Cream cheese frosting pairs perfectly with velvet cakes. Make sure the butter and cream cheese are at room temperature before whipping them together.
8. Allow cake to cool: Let the cake cool completely before frosting to avoid a melty or runny frosting.

Remember, these tips are general guidelines. It is always best to refer to specific recipes or techniques recommended by Velvet Cakes By Gwen or other trusted sources.