The below image, taken from this book, says it all. It is the only image of the excavations in Elephantine Island’s Aramaic Quarter I have found so far.
The above plan (significantly distorted), overlaid on satellite imagery from Google Earth:
Apparently, judging from Figure 5 of the above-linked to book, Site k is the House of Mahseiah and the Temple of YHW is located below and/or to the Southeast of the Roman Temenos wall (the “Khnum Temple Enclosure Wall” in the above image). Most Elephantine papyri were, according to pages 91, 102, and 263 of the above-linked-to Porten book, found in House m.