We spent 1 night in Gisella's flat in January in a very very cold weather.
Since we were 4 adults + 1 baby of 10 months old, the most important thing was a baby friendly and clean flat.
The floor is not covered by carpets. However, the apartment is correctly heated. So, I can say that there is no problem even in cold weather.
We particularly appreciated Alex's hospitality and his flexibility. He gave us great addresses (especially a very good breakfast place) and accepted that we leave our bags in the office. He even came on Sunday afternoon to give us back our bags.
As there is no lift, it was a bit hard with bags, baby and baby stroller but Alex helped us.
The building is not located in the city center but easily accessible by transportation system.