Hi Luca, I want to share my experience as a "buyer" with you, because people often forget that on the other side there is someone who has to spend between €3000 and €5000 (a price range to have some degree of certainty of not getting ripped off). For those accustomed to the world of pianos, these figures are not crazy, but unfortunately for those who do not belong to this category, they are significant amounts (with 5000 euros I could buy a decent used car, just as an example).
One of the problems for novices like myself, who want to approach the piano, is the enormity of information (sometimes conflicting) found on the web regarding brands, models, prices, etc., etc. Unfortunately, to this day, there is no website or entity that can "certify" the quality of a purchase (I am obviously talking about pianos being sold by private individuals); furthermore, while the piano is a fantastic instrument on one hand, on the other it presents a series of "uncertainties" when purchasing privately, which can only be resolved by someone with certain experience. I also find both the advertisements and the websites offering pianos to be poorly structured; for example, there are those who post blurry photos, those who only post photos of the cabinet when we know very well that the action, pedals, and soundboard are important, as is the serial number to properly understand its age, or a certificate verifying how many hands the piano has passed through; there are even those who put nothing at all and still expect to sell it, mah (the price must always be listed, anyway). Regarding websites, obviously, there is a lack of structure to support the seller; often sites only allow you to upload a few photos, and they are not structured with a good database so as to allow the entry of key data that can be searched for in a more precise and structured manner.
A thing I ask for more and more often is a video, preferably recent, where the seller shows me the piano in action; this is because often the person selling the piano is hundreds of kilometers away from the buyer, and that is no small matter—it's one thing to spend €10,000 and travel around Italy visiting shops, and quite another to spend €3,000 (in short, the game isn't worth the candle).
Another sore point is transport; there is never any clarity about that either (it's a shame that on €3000, spending €400/500 for transport is not insignificant), all of this only serves to complicate things.
I have only told you some of the aspects I have encountered, not even all of them; now you can understand why it is so difficult to sell and buy a piano. What surprises me is that despite frequenting many serious thematic forums like this one, in none of them have I ever found even a hint of an idea to overcome the problem; I abandoned this world for three years, and after three years, I see that nothing has changed.
I hope I have answered your doubts, even if only partially.
Ciao Massimo
ps obviously I would have ideas if anyone is interested...
pss for Simon, before spending 5000 on a piano and then discovering it's not worth it, it's better to spend 1000 and get a good digital one, where at least the damage is limited.