"It is not a couch."
Translation:Non è un sofà.
Un problema.... all right... trying to remember all of the exceptions you listed
On your smartphone you should install an Italian keyboard, which will avoid you having automatic corrections based on the English dictionary. I've installed about ten keyboards. If you don't want to install another keyboard language, you can hold down the letter "a" for a long time and all the accents will appear. If you use your pc, there are no problems, because all the necessary accented letters appear on the page, and from them you can choose the one you need.