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.i feel pretty safe in saying the tsar's tub was not like the giant cooking pot from Boblovo. i'm pretty sure it was more along the lines of a plunge-pool, like one of these:
these 2, are in the Pless Palace (princess Daisy of Pless' residence), in Poland.

(above: the tub in the emperor's suit)

(above: the tub in Daisy of Pless' bathroom. i think N II's tub was much like this one, although his was arabian/moorish in style.)
these 2 photos are of the plunge-pool tub in the palace of grand duke Aleksei Aleksandrovich


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Nikolai II's bathroom in the Aleksandr palais:



(above: this one shows his chin-up bar.....there's a well-known photo of Anastasia as a little girl, hanging from this bar. also worth noting are his towels.....no mere monogram for him! they appear to have the Romanov imperial eagle on them. of course, what i'm seeing may not be a hand-towel at all....but it sure looks like one to me.)