The housing market never ceases to surprise us. December marked a big moment: for the first time since mid-2022, home prices increased year-over-year in all 50 of the largest U.S. metro areas. Yep, every single one.
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How are you going to acquire 30 houses free & clear?

The real skill is understanding the variability and risk in each number which is not always numerical or scientific.

"But rates have been at 7% or higher in the past, and investors still did well!"

Best bet is to try local and credit unions, possibly may have some programs for better rates.

I have some YouTube videos that may help with some of your questions and always happy to have a call to dive a little deeper. 1. which development(s) tends to be the best for ROI/have the best occupancy rates? 

Nightly rates, occupancy and amenities.

That helps some...but your variable expenses also go up too - property insurance & taxes - so a lot of your rent increases go to offset rising variable expenses.I started at the age of 47 in 2018 and we bought properties fast and furious - 12 the first year, 10 the next, and 9 in 2021 and currently have 38 properties. 

The combination of Germany's stable economy, well-regulated property market, relatively low interest rates, and the opportunity for long-term capital appreciation make it a compelling choice for U.S.

Expenses went down and ratings / reviews went up.I did the switch after staying in an Airbnb that provided both flowers and local bakery goodies.