I have a lodger (my second).
I have two teen DC who are here half the week.
I stay at my partner's one night a week and one weekend a month. So lodger gets the house to herself fairly regularly.
My lodger has two rooms and some use of a shower room in our loft conversion. Shared use of kitchen, which is actually a kitchen/family room so I do feel a bit guilty about us being in there loads. When DC were younger, I'd take them out a lot to the park or on outings. Now they're teens, they spend more time doing homework and other stuff so it feels like we're in the house more.
London suburb, so high demand for rooms. I charge a fair price for the space/area. Last time I advertised, I had a high number of enquiries, including two single mums. I felt bad for them but had to say no because having another child here would have been a very different dynamic.
It has worked well for us and I (divorced) would have to sell and downsize without the additional income.
In fact, DC2 is out for the afternoon with our first lodger right now! Lodger1 had no family locally and was early/mid-twenties when she lived with us and DC were late primary/early secondary and absolutely adored her. More like extended family now. We also love our current lodger. Will be hard to have to replace her, too, when the time comes.