I enjoyed my stay at the Soleil. For context, I love to walk and randomly explore when on vacation. The location of the Soleil in the Old Quarter is great. It's within a 20 minute walk to Dong Xuan, the night market and the lake. The staff are very welcoming and helpful, especially at breakfast. The variety of food, both Vietnamese and Western, at breakfast was excellent. The bed was very comfortable, and they had a couple of different pillow types to choose from.
A couple of things to note about the amenities. Both the pool and the gym are more check box amenities than usable ones. The pool is very small. When I went to check it out, there were eight people there and it was too crowded to find a place to sit. As the person at reception embarassingly noted when I asked, the gym is "very basic", ie a couple of pieces of cardio equipment and some dumbbells crammed into a small room. These things didn't matter to me as I was there to explore.
One factor that did cause me to rate this hotel a 4 instead of a 5 is that my window faced a white wall that was two feet away...hahaha. I'm sure that's not uncommon with how tightly spaced the buildings are in the Old Quarter. It's just not a huge positive...lol