Perfect communications. Mario is very flexible on timing and very responsive.
Comfortable check in and check out with a code.
Perfect location near metro, railway station, restaurants and culture attractions. You can not come by car right to the front door, cause it is a walking street, but it is just the second house on that street, very close.
The staircase is quite narrow if you have big bags.
No problems with hot water, wi-fi and other infrastructure. There are towels, bed linen, extra blankets, shampoo, washing soap etc. Everything is clean, no smells. Probably you can find salt, oil and some other things in the kitchen. A lot of dishes.
The design is very nice. The interior is light and sunny, feeling like home. A lot of windows going on both sides of the house, real sunlight.
The matress in the bedroom was quite hard for me. But it depends on what you like :)
The only and the main dissadvange - was noise. It is the second floor and there is just old normal glass in windows without any soundproofing. Windows from living room goes to a noisy street with cars and windows from the bedroom goes on a walking street. May be it's because of low season- almoust everywhere in the centre there are house reinnovations now. And you can hear the noise from construction cars for the hole day. And in the early morning we heard the noise of cleaning cars.
And even we love the appartments and Mario very very much- to spend 2-3 days was fine for us, but not more.