Setup Accounting Software Ready to Manage Client Revenue

Hi
We manage short stay accommodation (airbnb) for a number of clients. This has slowly been growing and historically we have used spreadsheets manually.

WHAT WE ARE LOOKING FOR
As the number of properties are growing we need a more efficient and accurate way to manage client income and expenditure each month. Think of each property as a mini business that we manage on behalf of the owners.
We want to provide transparent data and information whilst ensuring we are not over or under charging (please note due to undercharging our business is losing money)

WHAT WE DO AT THE MOMENT
We use our booking system to avoid double bookings and process fees
We use spreadsheets for each property to monitor income and expenditure. Most of these are similar and consistent but when there is ad his repairs and maintenance to be billed back I find this is missed more easily.

WHAT WE WOULD LIKE TO DO
Use Accounting Software
Account for sales revenue - reconcile to confirm received in the bank account

Use Account for Expenses
Reconcile and confirm payments for cleaning fees - linen fees - card fees - travel agent commission - our management fee - any other expenses.

At the end of each period (monthly) we can run a report for each property and this will produce a statement of what is due to the owners as well as have the visibility to give owners the information in relation to the business/investment.

MY ISSUE OR CONCERN
I have spent months looking into different ways and people who have said they can deliver and only do half a job to the point where the current Xero accounting we have is a mess.
I see that a report of some kind that is property specific using either tracking categories or income/expense categories or a combination of both.

TIMEFRAME
Need something soon/asap

YOU WOULD.....
Ideally you would have either experience working with this kind of setup or have done something previous to this.

TERMS OF DELIVERY & PAYMENT
Happy to pay a deposit for the work but need to make sure the end product works before full payment is approved due to excessive failures previously.
Fully payment after the end of the month and successful delivery of such statements/reports.
WE would use actual data from previous or current month to check it works.

WHAT WE NEED TO KNOW

Which accounting software do you recommend?
How long do you expect this project to take you to deliver?
What approach do you plan to take to solve this problem?