I had the fortune to go to Nagoya this month, and while the trip was unrelated to tea, I did get to visit several public tearooms. The first was a modern-style tea room in Ni-no-maru Garden outside Nagoya Castle. It was built rather recently in 1969 and contains a formal 10 mat tea room, an unusual tsukubai, and a stone floored space with tables and chairs for those disinclined to seiza. This is a photograph taken from behind the ro.
Ninomaru Teahouse

In the tokonoma hung a scroll reading 「一期一会」or “Ichigo Ichie”, along with flowers taken from the garden. Notice how the scroll is written from right to left.

One reason given for the prohibition against stepping/sitting upon the tatami’s edge is that in days past the family’s crest would be woven in it, and stepping on the family crest would of course be rude. The edge of the tokonoma’s tatami here has kiri (pawlownia) woven into it, the crest of the House of Tokugawa, who governed this province.

Visiting the tearoom, you will be served tea and a sweet. I neglected to ask about the name of the sweet. (^_^;)

Here is a photograph of the ro taken from the kamiza. The window covered the the screen peers into the mizuya, where they made me my tea.
Ninomaru Teahouse

In the stone floored room, there was a replica of the golden tea kettle used the lord TOKUGAWA Yoshinao (I think).

And this is the Chausu (tea mill) used by the tea house from the time it was opened until 2007.

Ni-no-maru Garden was truly pleasant to walk though in the early morning, under scattering cherry blossoms and in shadow of Nagoya castle. If you happen to visit Nagoya, I pray you visit it.
Ninomaru Garden