I left them recently like many others have in the last 5 months and even though our money was technically an investment and a limited partner contribution, they refused to give anyone their money back even after stating numerous times they would give people their money back if they choose to leave. 

My core investing philosophy is pretty simple, and has done very well across almost two decades and numerous cities:1) Invest in cities with population (and job) growth2) Invest in parts of the city where household income is near the median (or slightly below)3) Invest in properties that provide cash flow from day 1 Thank you for sharing that. 

This included modernizing the kitchen with high-end appliances, upgrading bathrooms with spa-like features, and adding hardwood floors for a luxury feel Lessons learned?

I encourage you to define your financial goals, as real estate presents numerous possibilities.Building a strong foundation of knowledge and connections can significantly impact your success in real estate investing.

The open floor plan and natural lighting make the space seam bright and airy while the community features like the tennis courts Pool and guard service will make you feel at home.

I recommend you do an online demo to see the features that it offers.

I've used the search feature on this forum but didn't have much luck.Are there any US investors, hard money lenders, or groups that invest in flips outside of the United States, specifically in Europe (Netherlands, Spain, etc.)?

This included modernizing the kitchen with high-end appliances, upgrading bathrooms with spa-like features, and adding hardwood floors for a luxury feel Lessons learned?

I am curious to learn from others as well  :) I looked at GHL for my CRM but felt like it was full of features I'd probably never use and the cost was considerably more than what I ended up using: Monday.com.

@Austin Green if it looks optimistic, take a look at the amenities/features other Airbnbs offer in the area.