We are a couple and was staying in Prague for four nights.
The check in was flexible and we were able to self check in late at night. The apartment was clean and as described. Unfortunately there was no electric kettle, which was a small inconvenience, and also no place to hang wet clothes after washing. Although there was an electric dryer, it was located in the bedroom, so we couldn't use it as we mostly washed at night, so it wasn't really helpful.
There was a shampoo and a shower gel left for us by the owner, and also tea, sugar, and some other supplies, which was very nice.
The apartment is located rather far from the center, and we were aware of it. You can get to the old town by foot, but it might take around 40-60 minutes if you're not too fast of a walker. There are a lot of public transport available in the area though to take you there faster (around 15-20 minutes).
Overall we had a pleasant stay, and would recommend this apartment!