There were always pianos built to a high standard, and **** pianos built to cut the price. A hundred years is not really a problem to the former. If the glue will hold together, these should go 200 years IMHO. I've played many 50-70 year old beater uprights in Sunday School assembly rooms, and the main defect besides the tinkly preDepression sound, was key tops coming off. If you don't lose the piece that fell off, that is a $2 problem, which is the cost of a piece of sandpaper and a tube of super glue at the local dollar store.
Pianos are not autos, with many rubber and plastic components that deteriorate even when standing still. Pianos are mostly wood and cast iron, both of which last centuries if the rain and vermin don't get in. Pianos do have felt, and I would hope that in the previous restoration the geriatric felts were dealt with. Felts are designed to be replaced in a piano, so even old versions of these are not a great tragedy.
Broadwood is a historic name, one which I cannot evaluate since there may be various versions of it. But it is likely this is historic instrument of some merit.
One thing an ancient piano will have a modern one will likely not, is a solid maple pin block. As much as I like the sound of my 1982 Sohmer 39 console with the 5 ply pin block, the tuning stability of the 1941 Steinway 40 I bought in 2010, is far superior, in the same tough environment. My house swings 55-85 deg F summer to winter, and humidity swings too with the weather.