Great Service with some problems
The Alchymist Prague Castle Suites is well-located, just below the castle and only about a 3-or-4 block walk to the Charles Bridge. The room (#7) was spacious and generally comfortable. The bathroom is spacious and well-appointed. Breakfast was excellent, with tasty coffee, breads, fruits, fruit juice, eggs, smoked salmon, and many other items to choose from in a buffet layout. Since the hotel is small (seven rooms and one suite) there is only one table from breakfast, a round table seating about eight. It was ample, however, since breakfast hours are long and we never had more than one other family at the table when we ate.
There is another perk to stay at Alchemist. If you walk around town and decide you are too tired to walk back to your hotel and you are near one of the other Alchemist hotels, they will arrange a ride for you back to your Alchemist. We did not take advantage of this perk, but it could be handy for some.
OVERALL, we really enjoyed and highly recommend Alchymist Prague Castle Suites.
We experienced two issues. First, room #7 is on the top floor and heat rises. The air conditioning was limited on how low one can turn it and it was relatively hot outside (upper eighties in late September) and the room took quite a while each even to achieve a comfortable temperature. If the high temperature will be below about 80 when you visit, this would not be an issue for you.
Second, the water heater circuit breaker tripped twice, leaving us without hot water twice and having to request it be fixed. For us this was not a major issue.
Summary, we recommend this hotel for its service, general comfort, breakfast, and location.