I stayed at the Kalev Spa Hotel by myself for 3 nights while visiting Tallinn.
My first impression upon arriving the first evening was that the hotel itself is very conveniently located, just on the edge of the Tallinn old town where most visitors will want to be anyway. While fairly modern looking and clean, the hotel is not luxurious if that's what you are looking for.
I stayed in what the hotel calls a "spa-class" room, which I would recommend for most people staying there. The room itself was fairly large, quite clean and comfortable (but not luxurious). The bathrooms are modern and seem to be recently renovated. The hotel staff is adequate but not particularly friendly. Other than the very basics, they did not go out of their way to acquaint me with the hotel or the spa/pool/waterpark facilities, which I will get to below.
Breakfast and dinner are included in the very reasonable per night rate but could be very disappointing to some visitors if they are not prepared for it. I attended one dinner (the night of my arrival) and one breakfast (the next morning) and that was enough for me personally. I found the atmosphere in the dining room to be sort of depressing but it may be acceptable to more budget conscious travelers.
Having free access to the saunas, pool, jacuzzis and waterpark was a GREAT plus. If you don't mind the prospect of being in a room with many naked (mostly) Estonian men then you will probably enjoy the facilities. I found the spa/pool/watermark facilities to be a great addition to the experience but difficult to understand initially-- after taking a quick peek my first night to see what the spa was all about, it took me a 2nd visit to understand the system and the layout. That said, I returned a 2nd and a 3rd time during my stay which was a great option given the size of the Tallinn old town, which I came to realize only takes a day or so to tour properly.
Overall, I would recommend Kalev Spa Hotel to travelers on a moderate budget who will be staying in Tallinn for more than 2 days and are interested in having the option of the spa/waterpark to compliment their experience in the old town.
Room Tip: Spa-class rooms (or higher) are the way to go.
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This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC