Shadows is fine for what it is - very clean inside and my (Romanian) experiences have been pleasant and polite, if slightly distant. It's a marginally cheaper and less professional operation than the apparent chain of establishments which charge £70 for half an hour (The Massage Club, The Club, West Street et al.), but a significant improvement on the cheapest ones. The downside is that despite its location in a back alley, there is something very conspicuous about the entrance.
I'm aware that Central Massage has had a major refurbishment; this may also be the case for Adam & Eve's, which from memory is also wheelchair accessible. Neither were pleasant experiences in the distant past.