Leasehold with no service charge

Hello, I wanted to please sense check anyones experience and see if I should be concerned viewing the property.

145 year lease. Ground rent 300 pa. No service charge (I wonder if this is tied into the Ground rent)

House conversion. Ground floor flat with one flat above.

I understand any issues of the house are sorted between the two leaseholders.

Any questions I should have for the estate agents?

Thanks for any advice