We had a great stay at Modris' place.
It was clean and well equiped (Iron, ironing table, Hoover, airdryer, etc.)
The building in itself isn't really beautiful but the appartement is very cosy.
The couch is as confortable as a bed (if you like "hard" mattress you'll sleep like a baby in this couch).
The appartement is close to small supermarkets, a little bakery, etc which are all mentionned in the little guide in the appartement.
Modris was very nice. We chose to ask for the airport transfert and he showed us around while driving to the appartement.
He also gave us nice tips and advices during our stay and always gave us a quick answer while we were chatting through the Airbnb message system.
To conclude, if you're looking for a "non-hotel", cool and cheap stay in Riga, Modris' appartement is the place to be.