The suite I stayed in had some weird quirks. First, the shower was constricted to a 3 ft x 3 ft square raised about 20 cm from the floor. If you were to slip in it, you'd be at serious risk of face planting against the counter next to the shower (I know because I nearly did, the shower and floor itself were very slippery when wet).
Second, the single twin bed in my room barely had any bedding, just two pillows, a mattress cover, and a duvet. The mattress was okay but not terribly comfortable. I definitely had a budget suite! I don't know if it reflects the typical quality of their rooms, but claiming that Mercure City Center is a 4-star hotel is definitely pushing it based on what I observed.
On the plus side, the staff were very friendly and the breakfast options were top notch. Location also can't be beat. I don't know if I would stay again. As time passes I'll probably forget the critical parts of this review.