Space saver tire good. Air pump and tire sealant (goo) less good. Agree.
Taller tire will under report already under reported speed. Larger diameter tire will turn fewer times per mile, thus giving the impression of slower speed. You can use a good GPS unit to acquire relatively real speed, if needed.
195/55 16 tire definitely allows way more tire choices at replacement time. Wish we had a 16" Honda Alloy option to chose from for our Insights here in the States! You guys over there, get all the good stuff!