Stayed at the Janeiro in July for nine nights on a half board basis.
When we firsted got there at 4 in the morning porter spoke in German initially but obviously changed to English.
We Had an apartment which when we directed to found that it was actually over the road a ways wasn't to bothered though since we would be away from the hotel if there was any major late entertainment and noise.
Found the apartment to be good for a 3 star hotel. Had a seperate room for me and my wife and my 15 year old boy had a nice bit of privacy in the lounge area where he had a choice of sleeping on the sofa or the pull out mattress underneath. These being extra long and wide even I could sleep on with enough space length or width ways.
Food was ok, breakfast more continental than the full english and the German influence was present in dinner too but not too bad just found the choice lacking.
All together wasn't a bad hotel just too German, expected more spanish spoken.
The room was excellent, kept clean every day and changed towels regularly. Had enough to eat even though on a buffet restaurant the choice was not good at all.
Nice hotel, good room if you stay in the apartment and good base if like us you want to see the island mixed with sun worshiping. Oh and the beach was only about 300 metres away.

we have just returned from a week in the majorca resort of can picafort at the hotle janeiro. we booked through 2can travel to whom i spent much time on the phone to ensure all of our needs were met. when we arrived at the hotel we were greated by the staff not in spanish or english but in german! of the 300+ guests we were 3 of the 5 english guests booked into the hotel. the entertainment was in german, the food was all aimed at the german pallet and even the staff all spoke to us in german which was quite frustrating when we greated them with "ola" they replied "gutten tag". although we were all inclusive we eventually gave in and paid to eat and drink else where. there was a childrens club included but this was run by german reps and too. on the plus side the hotel was clean and the towels in the rooms replenished each day. - my advice - unless you are fluent in german dont book this hotel.