The self checkin process was great. We had some issues with the link (do it 24+ hrs in advance) and the code, but the support staff contacted by WhatsApp messages were on it, and got us into our rooms seamlessly.
Room was great - clean, well-kept, in great condition, modern. Note that being a self-check in hotel, it is a great exploration home-base, and it's not a fancy hotel with front desk staff and pampering, which is evident in the pricing. It's great value for a quality stay while you explore one of the best cities in Europe.