We stayed in seven hotels over a two-week period (3 in BsAs)... and in BsAs, Bo Bo is unbeatable. Perfect for the single traveler as well as couples/groups. Elegant, personable, unbelieveably helpful and friendly staff, beautiful decor in common areas and rooms, great neighborhood...etc, etc.... Too many good things to list in one message.
My next trip to BsAs will definitely include (hopefully) a stay at Bo Bo. (You need to book early, this place is very popular.)

Just return from a trip to Buenos Aires and Bariloche.
Stayed for 4 nigths in BoBo . Excellent , small hotel in peaceful Palermo section of BA. For less than 10 pesos ( $3) you can travel anywhere and return to the welcoming place. Very nice and helpful personel. Dinner in a hotel restaurant - excelent presentation and taste ! The best lomo ( sirloin) in Argentina. Try Bobo coctail.
Ready to return anytime.

I have yet to find another hotel which has made me feel as welcome and well cared for as Bobo Hotel. My husband and I visited the hotel twice on our honeymoon and the staff basically worked as our own 'personal assistant' for most of the time helping us organise tours etc on our trip. Nothing was too much trouble.

We stayed in the Argentina Suite which was fab with it's own large jacuzzi and terrace. We also stayed in the Pop room which was good too, and the classic - not so good because the speakers in the bar downstairs must be fixed to the ceiling by this room and are quite loud during the evening, but fine if your out to 2-3am which you should be in BA anyway!
Basically this is a gem of a hotel and definately the best place to stay in Buenos Aires.

Our first time in Buenos Aires was made even better by the Bobo. Courteous and helpful staff, great location and the breakfast was fabulous. Don't wait too long to book, this place is unique. Quaint neighborhood and a short cab ride to anywhere.