Tried following these directions, and found some pitfalls. Getting out of the Umeda subway station proved to be challenging. There are a 1000 exits and the maps were not very helpful. Eventually decided to go outside and walk around station and hopefully see the Yodabashi store. Found it, and another map that gave me a compass bearing. Headed north and tried to count blocks (3); but one man's alley makes anothers man's block. Lucked onto the right street (as you head north, you will come to a blue staircase on the sidewalk that goes up and across the road, go past staircase 10yds and turn right, now you are on the south side of the PIAS bldg.) Found the Toast Lady, but alas, she was closed, as today turns out to be a holiday
Walking back, I found the correct exit from the Umeda station. It is in the yellow circle#2 section, green square 3 9 exit. Go right as you exit and you are heading north from the yodabashi store (which is facing you as you exit).
Getting back to the hotel from the Namba station was another adventure...I'll leave that up to others to solve because I got lost, wandered, and did not take notes...