I gave Edgars a short call as we 4 girls entered the taxi at the airport, so he was already waiting for us when we arrived at the appartment.
Nice guy with good communcation and english skills. He gave us a lot of tips what to do in 48 hrs. Riga. As we've been very hungry we followed his tip to visit the Lido for lunch - great idea.
To put it in a nutshell: a good and clean appartment for 4 persons, just 10-15 min. to walk from the old town. Taxi is not neccessay in the night - the neighbour hood seems to be safe. One point: people with sensitive to noise could maybe feel disturbed by the traffic whilst sleeping.

But for us: Nothing to complain about. Thanks, Edgars!