Start by replacing the purchase price with the full acquisition cost in the denominator. Then obtain property-specific figures for transaction fees, annual property tax and insurance rather than using broad percentages. Those items can turn an attractive gross yield into fairly ordinary cash...
With thin completed-sale evidence, compare each candidate property feature by feature: location within Rome, size and condition, residential versus other space, occupancy and timing. A nearby asking price is still useful context, but not proof that anyone paid it.
Personally, I would want about a 4% conservative unlevered net yield here before considering appreciation. On €989,000 that means roughly €39,560 of annual net operating income. Against €60,012 gross rent, you therefore have only about €20,452 for vacancy and all operating costs. That is the...