This is a lovely stylish gem in the centre of Riga, well-linked, clean and quiet and full of thoughtful touches such as charging cables, dishwasher, a very helpful guide to the area, a selection of tea and heated bathroom floors (the list does not end here). While I have not met Martin in person, he was always available via airbnb and communicated very well.
One thing I'd mention is that the bedroom is separated from the living room by a wall but the wall does not go all the way up to the ceiling; so if you are in the bedroom and other guests are in the living room talking/watching TV you will hear them. Was not an issue for me and the flat is very quiet otherwise. Would definitely book again.