Goldens (like Labs) are very much people dogs, … that sounds as though you want it to be spending a Lot of time alone. I know its done regularly, but it isn’t good for them at all! Dogs get lonely much more then people realize. And board.
Temperment wise Goldens can be very lively (to be polite) or relaxed, … like any other breed just depends on the dog. They tend to be gentle, and Extremely Stubborn. Labs are often preferred as service dogs because of the Goldens stubbornness, and their health problems. Something you need to be prepared for (especially if you get an older dog) is that Goldens are prone to hip Dysplasia. In fact many organizations have phased out training Goldens as service dogs because it is such a wide spread problem.
This may be stating the obvious but its also worhth mentioning that they tend to run Really big, and have an incredible amount of fairly long hair, … light hair that floats and gets Everywhere. A Labs coat sheds but doesn’t compete with the Golden’s, and its heavier hair so tends to settle more.
Golden Lab crosses are terrific dogs and tend to be a little smaller. If you really want to get a dog (personally I wouldn’t be happy leaving one so much on its own, but that’s just me) I think you might want to down size a little, something forty or fifty pounds is easier to handle and deal with, and less likely to accidentally step on someone else furry and tiny and hurt them. My Lab was an incredible Darling, but at around seventy pounds she rather hurt my Yorky when she got over excited and forgot he was That close. (And however well trained and delightful of nature if you play with them they get happy and excited, its normal and desireable, … and needs to be remembered when there are other littler animals around. That same Lab literally tucked the 2.2 pound Yorky puppy under her chin and held a bone between her paws so he could chew it, she played with him so gently and sweetly when that was what she was doing, … but she still did walk on him at times.)
Weight gain is always a problem with Retrevers, you have to be very conscientious about helping them keep their weight down. That’s harder for some people, those who really like handing out treats for example. The weight gain becomes even more of an issue in breeds with hip problems since the more weight they put on the greater strain it is on the hips.
Just some things to think about. I really sympathize with you wanting a dog, I adore them and would never be without one, ….but they are very different and far more dependant on humans and human company/companionship then a lot of other pets.