Like any other major used piano purchase -- it doesn't matter whether it's Steinway or Fazioli or Estonia or whatever -- you must, you absolutely must, get a qualified technician whom you trust to look over the instrument and tell you what it may need. You also -- and this is perhaps even more important -- play the instrument for yourself and fall in love with it. You are spending a good deal of money and, if the instrument needs any sort of extensive work, will then spend even more money.
Some older instruments -- even over a century -- have kept their tone and good action (examples being my 1898 Model A and 1924 Model M Steinways) over the years, and have had whatever maintenance is necessary. Others, sadly, have not, and it doesn't matter what make or model they are.
I know this isn't much help for a specific instrument, but... best I can do for you.