Consider a flat fee MLS listing (~$100-$200), which gets you on the MLS and all major websites. 

Flat roofs only / pitch roofs only - does it even matter?

Thank you for your comment.For the numbers you gave in regards to the 14% And 5% that you are investors were making, is that based on yearly rates or a flat rate no matter how long you keep their cash?

In addition, some waterfall structures are complicated enough that the LPs can't easily track what they should be receiving which can cause some mistrust between GP and LP.I prefer a much simpler structure where the  GP takes a flat percentage of profits. 

However, I'm concerned about the temperature throughout the house especially as I rent per bedroom and the garage conversion (bought it like this) could be 2 bedrooms or a 1 bedroom flat with smaller room for office, small kitchen and living area.

Apparently people used to design buildings like this, pushing humid air into the attic, but this is a flat roof building and there is no attic.  

Among major U.S. metropolitan areas, Miami is perhaps the most exposed to sea-level rise, the result of its low, flat geography.

The seller can say that repairs are only $1800/year but the bank based on whatever percentage they use or whatever flat fee per unit... their number might be $5000. 

I’ve seen those types of places (old two flats) be bought in the $400k range, get completely gutted and redone on the inside  and then get sold for around $1m as a beautifully renovated single family. 

While SFR can be limited in parts of Friedenau, the possibility of finding a flat here and using as a STR might be reasonable- just a suggestion in making sure you're setting sights on a prime location for visitors.