Hotel Erdarelli is an old school hotel in all the best ways. The room was compact but spotless and nicely maintained. The concierge staff were super: friendly, helpful, and spoke English quite well. The breakfast was a classic Italian breakfast with fresh bakery pastries and bread, great coffee, and yogurt and cold cereal for us foreigners. Housekeeping was thorough so we always came back to clean towels and a spotless room at the end of our days. The hotel is extremely convenient walking distances to all the major site seeing attractions, except the Vatican. But even the Vatican was a reasonable walking distance away. (35-40 minutes or so).
If there is a downside to the Erdarelli, it is the wifi, which is weak and cuts in and out making it difficult to address business matters while traveling. We ended up stopping in cafes with wifi to handle business emails.