Although the list may seem intensive, I look at it like this: The total cost of all these items can be much lower than the cost to repair a hidden surprise after purchasing a property to flip. 

(Of course, there is a factor that higher rating will increase my booking but that is not just coming from adding one or two amenities) Besides item 5 and 6, I am not sure how much other items will attract more guests to my business.

By purchasing properties in high-demand urban areas such as Berlin, Munich, Hamburg, or near military installations, American investors can generate reliable monthly rental income.

What were the biggest line items?

Line Item Fee Collected Rents 10% of All Collected Rents New Tenant Search & Onboarding $500 Business Hour Service Calls $80/hour + Materials Cost + Tax After Hour Service Calls $110/hour + Materials Cost + Tax HVAC Cleaning & InspectionGutter CleaningSpring/Fall Exterior CleanupSeasonal Mowing & Weed TrimmingSeasonal Snow PlowingGeneral Contractor Vendor Cost + 10% Oversight Fee

Tenant had some risk items such as extension cord going from outside to inside which invited an inspection.

Some items might hold more weight than others, but you guys should sort through that together.You also might just do the partnership deal by deal - sometimes jumping into a partnership before you have officially worked together is NOT the best idea...

Tenants should pay for that.My lease considered normal to be a few items hung using 1" nails or smaller.

I just go in at the first of every month and code each line item to the corresponding property and note what the expense was for (Repair, HOA Fee, Mortgage payment, etc).

Type Line Item Fee Fixed Fee Collected Rents 10% of All Collected Rents New Tenant Search & Onboarding $600 Variable Fees Business Hour Service Calls $90/hour + Materials Cost + Tax After Hour Service Calls $120/hour + Materials Cost + Tax 3rd Party Coordination HVAC Cleaning & InspectionGutter CleaningSpring/Fall Exterior CleanupSeasonal Mowing & Weed TrimmingSeasonal Snow PlowingGeneral Contractor Negotiated Vendor Cost + 10% Oversight Fee