Hiya mate, like others have said, I’d avoid Poole. I grew up in that neck of the woods and it’s not the place I’d choose to spend any time if I had a choice.
You could try places like The Scott Arms in Kingston, or The Bankes Arms in Corfe. There are pricier options like Mortons Manor in Corfe or the Priory in Wareham if that tickles your fancy. Knoll House in Studland might also be pricey, depends on your dates I’d imagine.
You could push further west and look to Lulworth, Lulworth Lodge might be nice, but dates reflect the price.
Any of which would sit you nicely in the Purbecks, you’ve then got Swanage/Wareham/Studland/basically the nice parts close by, a much more relaxing break.
Places like Kimmeridge a little further afield.
The views and the locations will be quiet and out of the way with plenty of walks. I could type you an essay but feel free to DM me for more info.