P. 159 in the 4th paragraph, the church Kiddist Maryam you are speaking about is not the church located at C4, map p.162. As you state, the trio of historical churches you describe are situated west of the Ghebi, the Old Palace. That Kiddist Maryam should not be confused with the one on the map p. 162 between Arat and Sidist Kilo. In truth, the church you are discussing does not appear on any of the closer range maps of Addis.
P. 406, in the para just before the last, concerning “An ambitions excursion out of Asbe Teferi”, you speak about the forest and caves on the slopes of Mt Arba Gugu (3625 m high, according to my map) located some 100km east of Asbe Teferi. If I am not wrong, these places are all west of Asbe Teferi.