We were 12 people and had an amazing stay in Imants huge appartment. It is well-located in the old town of Riga with lots of bars, restaurants, clubs within a short hop.
The appartment itself is clean, offers enough space and the wifi worked well. Only negative point is that there is just 1 bathroom.
Check-in and check-out took place without any problem and I can recommend this appartment to everyone looking for a short trip to Riga with 7+ people.