We stayed at Karlis' for two weeks after arrival to Latvia, which meant 10 days of self isolation. That put specific requirements to the place, on top of usual considerations. First and foremost, we needed cooking. I believe you will never find another property on AirBnB in this price range better placed for that particular subject. It far exceeds any conceivable needs. Plethora of pots and pans, knives of unusually high quality for such place and many, many more. We have found exotics like curry powder, flower, vanilla powder, and even honey!
There are as many as four supermarkets in walking distance.
Otherwise, the location is a little bit far from downtown, but it is unusually green (there are trees on either side of adjacent streets, a very rare case in Riga), and very (very!) quiet. As a bonus, you will find off beaten tracks sightseeings, like centre of wooden architecture, and historical Great Cemetery, otherwise out of typical visitor's reach. There is a very good view from all windows, nothing obscures it and consequently light (very important in Riga).
The apartment is on the fourth floor of a renovated building, no lift. Nice lobby, again, very quiet. Apartment has a lot of space, for two of us. All amenities worked well. Good quality bed and bedding, though some people may find the the mattress to be a bit too soft, but this is something personal.
Karlis was very responsive, like all small troubles were usually fixed next day (we had issues with kitchen utensils).
We would highly recommend the place.