The photographs kinda speak for themselves - the Palazzo Massimo is beautiful.
On the top floor is Livia's room, along with other frescoes roman houses - one of which may be Agrippa's and although less stunningly breathtakingl is still quite amazing.
There are stunning mosaics, in black and white and colour, of geometrics and fanciful scenes.
Further down are statues of a quality much higher than I expected from all the "roman statues are just poor copies of the greek" stuff you read in art history books - the portraits are particularly fine and interesting.
A trip much recommended - especially as the place is lovely and cool, without all the crowds you can get in some over museums (yes, Galleria Borghese, I'm looking at you!).