Excellent location! Right on the river, 5 minutes from the tram, around the corner from the Metro. Convenient to get anywhere, although if you walk it is a bit of a (pleasant) hike to the Old Town.
The space is HUGE, plenty of room for everything. Good fan for summer but inside is quite cool so you don’t really need it. Jarin is a super nice guy, has a whole pile of useful books and guides for Prague. Would certainly stay again next time in Prague!