From Termini you have to take via Giolitti and go on to direction of Viale Manzoni. When you reach viale Manzoni turn right and you will see restaurant LA TAVERNA DEL RE. So turn right again and you will be at via Principe Umberto 77 APARTAMENT NR 1. The nearest Metro station is Manzoni, but from Termini it takes just 10min. by feet.