Nefertiti lives up to its very lofty name as it's one of the finest jazz spots in the entire Tokyo metro area. The owner Kurita-san is an extremely friendly host; he is an ex-teacher who opened the cafe after retiring several years back. (He has a long history with jazz and told us some hysterical stories of working in a 'jazz curry' shop when younger, then meeting his wife there as she was a regular customer).
The joint is quite a bit larger than the average jazz spot with plenty of seats and a small stage toward the back window where there are live sets once or twice a week. There's a lot of natural light too, a nice change from the usual dark and dingy jazz bar feel. But by far the main attraction in Nefertiti is the ridiculously good sound system; Kurita-san proudly showed us several profiles of Nefertiti in Japanese audio magazines. (For those who know, here are the specs: JBL S4700, fet cr-nf equalizr amp MODEL FET99 / marantz SUPER AUDIO CD PLAYER SA-14S1 / Stereo control center C-200L)
Kurtia-san has a huge collection with some especially rare experimental/free jazz albums; I was really surprised and impressed to see a live Don Pullen bootleg album from the 70s just casually lying on a table. It's not just heavy free jazz on the system though; the first record he put on for us to hear the audio system was some fusion-guitar from the 80s and there are plenty of jazz vocal albums hanging up above the seats so you'll get all styles of music here.
Nefertiti is a bit of a trek as it's a little far from Masuo Station but it's more than worth the time it takes to get there. Opening hours may be a bit flexible so if you're planning on going for a bit of a session then good idea to call or send a message ahead of time. See pics of Nefertiti over at Tokyo Jazz Joints.
From Kashiwa Station take the Tobu Noda line just a few stops to Masuo Station. Take a taxi from Masuo; I walked back but it's easy to get lost in that area.