Lodgers love to have an Ensuite. Many houses can't offer that, but if you can, it really gives the edge because people do prefer not to share the loo and bathroom if it can be avoided.
Important things are ; parking, reasonable access to communal areas and storage space in at least some of them, lack of bossy rules, owner being low-key and not desperate to import someone to the house who will become their best friend - so giving people space, decent sized bedroom ideally with Ensuite, modern decoration and any provided furniture being clean, simple, modern and working, decent shower, modern, clean kitchen and bathroom, neutral carpets ideally, good orice with bills included, no rigid rules about when heating on, the odd person staying over, having friends to visit for an evening etc....but no-one should expect to turn it into a party house or move in their boyfriend.
Location is important - close to good transport or walking distance to key places of employment like hospital are good. If your location is t good for easy public transport to the town or places of work, you will command a lower price.
Also, age of owner can be important. Most lodgers are younger (not all clearly, but many are) so if you are in that category, it gives you an advantage. Most young people seeking lodgings don't want to live with a middle aged person.
Realise you can't do anything about your age or the location of your property or probably if it has an Ensuite.....but these things might explain a lack of interest.
If you are an older middle aged lady, you might have to wait longer to find a similar person who will want to live with you.
Oh, and lots of people seeking lodgings don't want to live with children. That will reduce the market significantly too.
Sorry to mention lots of negatives. I can remember being a lodger in my 20s. I'd have hated to live with 'old' people over 30 and worse still with kids. That might have been my immaturity, but I needed to feel I was sharing with people like me at that point.