I am not really active (anymore) in that segment, but i will try to give you a few general answers nonetheless

. For details you might want to read the corresponding threads dealing with particular locations or consult our asian expert Sensitiv.
Prices: With a bit of haggling and showing the intention to leave €50 for 30 min and €80 for 60 min is feasible in most studios. The latter is probably easier to achieve.
Language: The majority of asian sexworkers speaks neither german nor english. The price and service negotiations are usually done not with the girl herself but the bawd. The only chinese girls i spoke english with were Nana in Mollardgasse and AHong in Ullmanstraße both no longer active. And their german was non existent, while their english was ~100 words. Recently some improvement in their german skills seems to be noticeable if i interpret the forum reports correctly.
Location: The Studio i liked best was
Japan Massage.
Fröbelgasse is allright too. Discrete Entrance and a separate shower for each room.
Specific Girl: This is much harder since most i know of are no longer active. Lili (formerly Ida from Fröbelgasse) and Sasha received loads of praise recently. Both work in
Asia Studio. If visual appearance is a factor Lina from Mollardgasse and Kimo (Dampfgasse/Jägerstraße?) might be good choices too.