"The Carlyle" is among the better looking properties from Synergy. Located barely 2 miles from the Great America Parkway, it is close to Yahoo, Sun, Citrix, Nortel, Cisco and other landmarks of Silicon Valley. It is within 20-30 minute walking distance from LRT (to Mountain View), shopping and food plaza (Rivermark Plaza), many other extended stay hotels and 'normal' hotels like the Hilton, Hyatt and Marriott.
The community has a fitness center, a swimming pool (of dubious hygiene) and secure access. The apartment facilities include Comcast cable TV, wireless internet (free for us), washing machine inside the apartment, dishwasher and full kitchen. Parking and secure mailbox is also available. We found the design of the apartments a little wonky, with crooked walls that make the rooms look smaller than they are. It is quite OK for a solo business traveller but not those traveling with spouse or kids.
From a personal viewpoint, for less than 3 months, a Residence Inn, Townesuite or Extended Stay hotel may be a better option at almost the same price ($90 a night, plus taxes). The lack of housekeeping facility means you either hire maid services at $100/month (weekly) or sleep in a crumpled bed (ugh!). For a 4-6 week trip, I can do without having to take out my own trash! Some long-stay hotels also offer breakfast which is more attractive to solo travelers than a full kitchen.
Overall, a good place to stay if you want a "home" away from home. Those who prefer to let some one else cook their breakfast and take out the trash will be happier in a 'normal' hotel.