I have a studio i rent out. Never have any issues getting tenants but its cheap, well maintained and in a perfect location.
Things to consider
Can you afford the repayments (plus council tax, insurance, etc) if its empty. Or if the tenant doesnt pay rent.
What EPC band is it, how much will it cost to bring up to at least a band C (insulation, double glazing, etc). By 2025 the rules are changing.
My previous tenants were all relatively short term, they'd stay for max 1-3 years then move for work, or move in with a partner. So studio's tend to have a higher turnover of tenants (although my current one has lived there for 5+ years)
Also, do you know a good, reliable trustworthy electrician, plumber, etc that can come and fix issues quickly if something does break in the flat?
Please double check the freehold/leashold status very carefully as that sounds unusual. And what you'd be responsible for paying, e.g. If it needs a new roof where will that money come from.