We visited Riga as a group of 6 adult men (all late 20s / early 30s). We wanted to do some sightseeing, some partying and just have a good time. There are two single beds, one double bed, and one extendable couch. On the couch, two adult men can fit comfortably. For the double bed and the couch, there was a large duvet to share each, which was no problem for us as we are all good friends.
For us, the apartment was absolutely perfect. It is dead center of old town, and we never walked anywhere for longer than 10 minutes. It is completely renovated and in top condition (so no need to be worried about the house's exterior or the staircase, which are not renovated).
Ervins is a perfect host and made both our check-in and check-out flexible to suit our flights (as there were no reservations directly before or after us). Ervins showed us the apartment himself and gave us tips for restaurants, bars, and sightseeing. He was also approachable via WhatsApp throughout our stay.
100% can recommend if you're looking for a trip similar to ours.