pointless is expecting loads of praise for a pretty n00b map for game whose mappers are dwindling in numbers.
that being said, a few pointers: use more detail. there are tons of spots in this map where the floor texture, which is 32unit squares, are cut off by 16 units on walkways. why not put a line of trim there? also, there are a million idbase textures and variations on all of them. they also look good aligned to the grid. (i might point you towards the idbase megawad at my site -> http://www.chesapeake.net/~rjoneill
and the items disappearing is a bug of worldcraft's fgd file and how it handles items. i think czg's fgd (whew) is at http://www.planetquake.com/greyvoid/quake.fgd
this map is ok, albeit unpolished/finished. far better than your first. keep mapping.