I know the teacher and some students of Kashin Roma
and can highly recommend to practice with them.
The do aikidō in the line of Yamaguchi -> Endo/Tissier: Flowing, soft, light, but efficient.
And they are very nice people!
Their place is situated "in the middle of a line between" Vatican City State and Frascati. (This I know from google maps ...)
You will find videos of their aikidō and every information you need on their homepage.