What is the Annex Building? Is it part of the same property? Is there a difference between the Annex and the main hotel?
Babuino 181 is composed of two buildings on Via Babuino. The "annex" is simply the building across the street - it has a variety of room selections (some larger suites) and there is access to the same hotel services including the concierge and the rooftop terrace.
We stayed in the Annex building on our second, one night stay. The room was very similar to the one in the other building - very nice, plenty of room, great bathroom, windows on to the street. We were told the annex rooms are newer than the ones in the main building, but really I couldn't tell the difference. The main difference is obviously having to cross the road to go to breakfast or talk to reception. We had no complaints whatsoever.
It's across the street from the main building. Rooms are very nice and have a great view.
Get an answer from Babuino 181 staff and past guests.