Well, my flat is slightly bigger than yours (103 sqm) and the i7 doesn't make it on one charge. It charges in between and then continues to suck for about 20-30 minutes.
The Roomba i7 is equipped with a new navigation system compared to the Roomba 980 which enables it to clean more efficiently. Accordingly, the battery life could be reduced, especially as it has the possibility to recharge during a cleaning cycle.
95 sqm2 is no problem for the Roomba i7.