Your itinerary sounds great! I’d recommend sticking to three nights in Hangzhou since the West Lake area is stunning, and you can easily explore it via public transport. Nanjing is indeed a bit off the tourist track, but it’s rich in history definitely check out the Nanjing Massacre Memorial and the Ming Xiaoling Mausoleum. As for English, you might find it limited, but most signs are in both Chinese and English, so you should manage just fine. If you're worried about the language barrier, consider downloading translation apps to help. Skipping Suzhou might be wise to avoid the hassle of constant packing. I had a day tour in China through https://gowithguide.com/China If you’re considering a tour, it’s definitely worth. Enjoy your trip!