well, good luck finding any caresheets, i really dont think there are any available. the worst part is that the uroplatus book gives almost no information, and the most helpful thing they could have given us the locality, but they mention that its being kept secret for whatever purpose, whether its to protect the species or whatever. but if they could have given a locality, then people could go ahead and try to get weather reports for whatever region they might be from...so since ive kept mine ive kept them as ive kept others, right around 72 degrees C, although i do remember hearing that they were possibly from a warmer region of madagascar, but i have never found out the truth of that or not.
as for the size, i would say they're definitely smaller than henkeli, definitely bigger than phantasticus, which would put them at the medium size range, probably closest in size to sikorae. now i remember reading somewhere that pietschmanni should be kept the same way as sikorae, and i think that was for their very basic similarity in size and appearance, plus ive heard pietschmanni used to actually come into the US as mossies at times. still, i think mossies might get just a tad bigger than pietschmanni, and i have only very recently gotten a pair of sikorae so i cant tell the size difference myself just yet, dont know if these sikorae will be growing more or not.
the best news is that the pietschmanni, at least the trio i have, are EXTREMELY hardy. like i said, i keep them at the same conditions temp and humidity-wise as all other uroplatus, but have heard rumors they come from warmer, drier regions. still mine have done very well and the only thing that i havent gotten them to do yet is breed. we'll see how it turns out. leah and mad_1234 should be able to chime in here as well, i know they have some.