We stayed at Zebs place in february.
Heating was a bit complicated but we were very contempt with the location. Quiet area and in walking distance to Charles Bridge.
Heating of the appartment was something we had to figure out. Keep in mind this was in 3-7 degrees celciuos weather outside.
There was one noicy main heating box in the bedroom. Furthermore, two mobile heating devices was there to be used. These decices combined made the appartment warm though.
Hot water ran out in 5-10 minutes when showering. If spend in the morning, the hot water tank was filled up in the evening again.
Instructions for checking in and out was very clear and easy. Further communication was also effective if needed.
If you stay at the appartment in summertime I can easily recommend for the price. Good suggestions for going out, wifi, very good location, easy check-in and out. Hope you have a nice time in Prague :-)