Seek legal advice to ensure the contract complies with Greek regulations.

It's great to read the books you mentioned that cover the basics but bear in mind that investing in different countries can be very different and you cannot blindly apply a US recipe on Greek real estate.

We removed an ancient one when we rehabbed the SFR we have.

Reasons why they don't close: 1. borrower doesn't tell the whole story 2. lender fails to ask questions 3. property in bad condition or C class and doesn't appraise for sale price 4. borrower believes it can rent for a lot more than the market shows 5. property weird/ancient crumbling/not habitable 6. title clouds...Here is what you need to start to work with for DSCR at many "shops":Loan amount above $110000, your mortgage FICO 680 middle, no forbearance/ no mortgage lates, market rent survey and rental agreement more than cover the PITI, you have a written quote for insurance, you have reserve money in your checking account, the down and closing costs are in your checking account, you have the vesting ready to go, property is not a rehab and is ready to rent, your lender broker has been in the business more than six years and can quote all the terms and ins and outs needed. 

In fact five of the people in my wedding party were friends from London (one Finnish, one Saudi Arabian, one Greek and two Americans).

It’s an ancient argument to which sensible investors no longer subscribe.

That ancient Hawaiian disease lackaloot worked to motivate me back in the day.I didn't know what I wanted to do when I was young.

As a certified lead technician licensed by the State of Ohio it has become obvious to me that  once a landlord installed vinyl replacement windows and new flooring over ancient wood and asbestos tile floors this can become a tenant cleanliness issue.   

Who knows, but the Greek was just the tip of the iceberg.

Tight enough to capture most pollen and dust, but not so restrictive like the expensive filters.My unit is an ancient one from the late 70s or early 80s.