At the hotel's website, Thission is introduced as a family business - and that's what it really is, with all the pros and cons that it brings. In other words, the atmosphere is cozy and the elderly woman (a member of the family, obviously) that served us was very nice, but don't expect any kind of sophisticated business service here. I think that the hotel still looks quite much the same like when it was built, almost half a century ago - so it can't really hide its age.
But let's talk now about the most important - the view! I am pretty sure that Thission is the hotel that offers the best view in whole Athens - it is actually just opposite to the hill of Acropolis. The pedestrianized street in front of the hotel is also one of the most beautiful in Athens; quiet, picturesque, with some tasteful cafes and restaurants (Thission maintains its own cafe on the ground floor, as well). The hotel is very close to Thission metro station, which makes it a great base for exploring the beauties of Athens.
However, the hotel itself is a bit rusty. Almost everything is old inside - the beds, the furniture, the doors, the decoration - even the air-condition, too. Our room was actually quite spacious, in contrast to the bathroom, that was probably the smallest and the most inconvenient that I have ever seen in a hotel (a typical example of the notorious Greek urban architecture of the 1960's). The hotel's age is the reason why its prices are still moderate: we paid 80 euros/night for a double room in June, which is not too much for such a view and location.
In conclusion, I think that the deal is clear: you get a great view and location, but you need to compromise a bit with the interior. Depending on what matters to you the most, you can proceed or stay away. If you are planning a long stay, you should probably think twice; but in my case, I stayed in Athens just for one day, so I haven't regretted at all for choosing Thission hotel.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC