I have just returned. I inspected the piano in question. The impression was not bad. We spent an entire afternoon playing, dismantling, commenting, and photographing. The person was very helpful. According to them, the piano is from 1974... it has its years, it has been played quite a bit and it shows.
The hammers need to be shaved or perhaps replaced (this is what worries me most of all). At least half of them show actual truncations due to wear, including the treble hammers where the striking point has gone to hell! The action (Renner) is quite heavy but not annoying (I am used to the Yamaha S90 digital piano); in some keys, you can feel a bit more of the click due to the felt bushings (I believe) being a tad flattened (the latter were inspected after removing the action).
The sound is warm and full-bodied but perhaps shrill in the mid-highs. A almost metallic sound can be heard, but perhaps it is due to the flattened hammers.
I noticed the difference in timbre when transitioning between the wound strings and the steel ones, as Paolo had already mentioned to me.
I played some strong chords and noticed that the sound sustains for a long time which, together with the inspection of the soundboard showing no lesions or cracks, suggests that the latter is in good condition. The strings do not show rust except in a few spots, and by turning only two tuning pins, they seemed regular to me.
It needs a thorough dusting of all its parts, tuning, and regulation of the action if one wants to bring it to perfection. The asking price is 3000 euros. Here are some photos!!
If I want, I can start studying and then perform the necessary maintenance over time. I know that a grand piano (half-grand or 3/4) would be better, but due to both space and budget constraints, I cannot ask for more, "I have to settle" ๐.
Thanks in advance to Paolo and to everyone who wants to advise me!
Lorenzo