I grew up with an aga. You don’t /shouldn’t really use the hob much (just put pans in the oven) as it becomes v inefficient with the hob covers open. So a 60cm version is probably not a problem size-wise.
They made a lot of sense when the aim was to have one warm room for all day, plus a fireplace in the living room in the evenings. But now most people have central heating. Agas are just so expensive to buy, install, and service, and then use oil / gas/ electric at a rate that makes central heating more environmentally appropriate.
They are great for drying stuff. In exactly the same way that a storage heater would be! I don’t think that’s a reason for having one.
They’re great for anything slow cooked. But then, slow cookers are also pretty good at that...!
If you really want one, then at least make the most f it with an armchair beside them. You can’t really put food cupboards immediately beside them (well, you can but it’s a bit yuck and pointless). Though really and honestly, you’d be better thinking about a wood burning stove / gas fire / etc. It’s more controllable, better for the environment, nicer to look at, cheaper to buy, instal and run....