Overall: highly recommended
The good:
Great communication before arrival. Directions were clear. Jakob is a clever guy and has a unique sense of style. He has designed his apartment for air bnb, having renovated three bedrooms into suites for his guests. The rooms feel fresh, clean, and charming. On arrival there were towels, toiletries and small snacks for us.
Jakob has gone out of his way to give visitors maximum exposure to Prague. He provides tourist maps as well as a booklet he put together himself of all the local highlights (sights, restaurants, night life, you name it). He has erected a large map in the hallway for reference to each attractions location. He also guides you through the map on arrival and makes himself available for questions, as he also lives in the apartment.
The view from the terrace is quite amazing during the day and at night.
The bathrooms are clean and functional, nice warm showers. Good sized kitchen with dedicated space and mini fridge for air bnb guests.
There is free wifi and it is stable and reliable
The not so good:
If you visit Prague in July and August, it will be HOT. The rooms also get quite hot. The second night Jakob provided a fan which help tremendously.
Location is satisfactory. It's down a street between two major tram stops, so you end up walking about 8 minutes to access public transit into downtown. It's close enough to walk ~40 minutes), but as Jakob said himself, there isn't much to see between the tram stop and old town.