Run a combined stress case, not just separate best-and-worst assumptions: rent 10% below expectation, a full vacant month, higher maintenance in the same year, and a major repair. If borrowing, add a higher-rate scenario too. The useful result is the cash left after all of those happen together...
What information is actually available on energy performance and insurance? Those points are mentioned, but not what evidence or records can be provided. I’d also ask whether service charges cover any building services relevant to energy use, rather than treating the apartment and common areas...
I’d ask about response times too. Owners often focus on how quickly a tenant might be found, but the more useful commitment is how quickly enquiries are answered and updates are provided. Availability is partly market-dependent; communication standards can be written into the scope.