In addition to the other comments (which I agree with), the renovation will increase the rent, and thus should make the properties even more CF+. You would only do the renovation if this is the case. And generally this is one of the reasons for doing renovations. Your rental yield should incerase.

The second reason you would do a renovation is to increase the value of the property. The value should go up by more than the cost of the reno.

If your accountant did not explain the above then don’t bother asking them for any further investment advice.