What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Verifying last 2 years of rental history very important!

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

I Offered it to them at 10% below market with him paying utilities. he wanted it, so I screened him to verify he can afford it.

Mind you, with mortgage interest rates in the US being so much higher now (and seemingly for the foreseeable future), I wouldn't be surprised if LTRs in Europe would cash flow better than in the whole US nowadays (to be verified).This being said, I don't and would never invest in LT rentals outside of North America  as I wouldn't want to face unfavourable landlord/tenant laws as a foreigner.

Verifying last 2 years of rental history very important!

So, while on the surface it sounds like you are entitled to your money back, a closer look at the contract and circumstances is needed to verify that.

As sponsor you have a VERIFIABLE track record of success in same or at least similar investments 2.

She took about two months studying outreach particular niche and instituted a program in steps where the results could be verified before implementing the next step.  

One of the utilities, South West Gas, based in CA, gave me a hard time putting the account into my own name. after several calls, faxing the court-stamped eviction order, verifying my deed through the County, etc,  the operator finally agreed and started to backdate the account change to the beginning of the process!